{"as_of":"2026-08-21T09:17:00Z","caps":{"database_statements":6,"inbound":100,"outbound":100},"context_digest":"sha256:62b7cc373889398e1e15fd6634f283f04bfcb11b6b135f9750aa81455f315572","coverage":[{"denominator":55,"lane":"reference_resolution","note":"Typed states for the displayed outbound observations.","records_observed":55,"source":"paper_references, paper_reference_links","source_observed_at":"2026-08-16T00:25:58.248074Z","state":"measured"},{"denominator":55,"lane":"standing_notices","note":"One-hop event checks from named stored sources.","records_observed":55,"source":"scholarly_work_events, retraction_status_cache","source_observed_at":"2026-08-21T06:32:19.484+00:00","state":"measured"},{"denominator":0,"lane":"inbound_itemization","note":"Pith citing papers itemized under the disclosed page cap.","records_observed":0,"source":"paper_references, paper_reference_links","source_observed_at":null,"state":"measured"},{"denominator":1,"lane":"external_citation_measurements","note":"A source-named dated measurement, never combined with another source.","records_observed":0,"source":"cited_works","source_observed_at":null,"state":"measured"}],"external_citation_measurements":[],"inbound":[],"links":{"evidence":"/evidence","html":"/paper/2608.11916/citation-record","integrity":"/paper/2608.11916/integrity","json":"/paper/2608.11916/citation-record.json","paper":"/paper/2608.11916"},"outbound":[{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.094868Z","title":null,"venue":null,"work_id":null,"year":2021},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":1,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.094868Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:28c498326615d2fabdf12a109253439a0ce33599cf097ae50624d8bcf34aaa38","observation_id":"fd24b7cf-dace-496c-b13c-f44f2970f1cd","resolution":{"observed_at":"2026-08-16T00:25:58.094868Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.098085Z","title":"F., Argudo-Fern´ andez, M., et al","venue":null,"work_id":null,"year":2023},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":2,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.098085Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:5a95c2669f1cd4c89de103407c61907cca32b4dc046f680882052a6cfa74c84e","observation_id":"3ddf9135-a970-40b3-bec2-2fe0c34449d6","resolution":{"observed_at":"2026-08-16T00:25:58.098085Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.100802Z","title":"1993, ARA&A, 31, 473, doi: 10.1146/annurev.aa.31.090193.002353 Ar´ evalo, P., Churazov, E., Lira, P., et al","venue":null,"work_id":null,"year":1993},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":3,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.100802Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:0a91806a78ea27e6aaf3795904e271bcbf975507c20bd6310f16996e3371cc90","observation_id":"7c28af65-ba0f-4295-af4e-c74e4a454525","resolution":{"observed_at":"2026-08-16T00:25:58.100802Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.103208Z","title":"A., Phillips, M","venue":null,"work_id":null,"year":1981},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":4,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.103208Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:93084bba3df902a507d3ec85f0f57183f2bc17e03d53cd0bbf438f5085d016b2","observation_id":"f8742b7a-7a15-4eb3-8865-16a53ddfa9e9","resolution":{"observed_at":"2026-08-16T00:25:58.103208Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.106657Z","title":"2019, ARA&A, 57, 467, doi: 10.1146/annurev-astro-081817-051948","venue":null,"work_id":null,"year":2019},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":5,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.106657Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:12523f71ca4e09c77a61f136d0d9be03baef127ce02be256fc9c4a07c7e91a08","observation_id":"5899cd7c-d3a1-4741-a075-8bf4b0be08b0","resolution":{"observed_at":"2026-08-16T00:25:58.106657Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.109259Z","title":"J., Shen, Y., Blaes, O., et al","venue":null,"work_id":null,"year":2021},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":6,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.109259Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:0d95647dc98551d645040fdecc03e2e00696c5734336b4ae4f4390c287c96400","observation_id":"0cba0fcc-14d1-4794-8715-d82a48d030d5","resolution":{"observed_at":"2026-08-16T00:25:58.109259Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.112010Z","title":"2018, ApJ, 855, 117, doi: 10.3847/1538-4357/aab091","venue":null,"work_id":null,"year":2018},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":7,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.112010Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:1bf51a24f06cad6b01ebd1d98d2107a5156bd8a1d4e9e9c47390822e0a3e7284","observation_id":"48243bde-e2d2-42d2-9d78-3ce47b208cec","resolution":{"observed_at":"2026-08-16T00:25:58.112010Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.115305Z","title":"2019, Nature Astronomy, 3, 251, doi: 10.1038/s41550-018-0659-x","venue":null,"work_id":null,"year":2019},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":8,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.115305Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:d96de7bc9937b12f06898d46767d36b15065d3f222bc996fe50a2caba281bd55","observation_id":"9d1445e5-7fd6-4ccf-bc57-77ce1da7614e","resolution":{"observed_at":"2026-08-16T00:25:58.115305Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.119628Z","title":"1964, Physics Today, 17, 21, doi: 10.1063/1.3051610","venue":null,"work_id":null,"year":1964},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":9,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.119628Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:d31a810747061717ae45af96aa31064f454e5c54bfe1408b5f719e0f38029df3","observation_id":"ceffc1dd-6397-47a4-b633-616c70043b9e","resolution":{"observed_at":"2026-08-16T00:25:58.119628Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.122572Z","title":"2011, ApJL, 727, L24, doi: 10.1088/2041-8205/727/1/L24","venue":null,"work_id":null,"year":2011},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":10,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.122572Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:4e0b239f4e36d5a76d5a926ae1fe3e3d35e86399e56122c94602dcdc795df8b2","observation_id":"43966814-a718-4493-bfbb-10cc7f4017e4","resolution":{"observed_at":"2026-08-16T00:25:58.122572Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.125132Z","title":"W., & Rix, H.-W","venue":null,"work_id":null,"year":2026},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":11,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.125132Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:296b4dde39c41954a51f169ef3200a32e01e00bc62e9ba3dfc5cd3f250e502d1","observation_id":"d840391a-515c-4430-bb39-9328de7431d6","resolution":{"observed_at":"2026-08-16T00:25:58.125132Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.128084Z","title":"S., Landau, S., Leese, M., & Stahl, D","venue":null,"work_id":null,"year":2001},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":12,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.128084Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:126047a20f50f5918f2840643a5721c97c54821e42ead2360cb84f3659a83b5c","observation_id":"4589afa9-852b-4227-a0c8-495d23e000ac","resolution":{"observed_at":"2026-08-16T00:25:58.128084Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.130847Z","title":"M., Peterson, B","venue":null,"work_id":null,"year":2017},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":13,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.130847Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:f2cac0ffd176f2bb65c4e6afe95bde5de1f2bbf76ac96c750d1ea24943b7c524","observation_id":"1d2ee227-21b6-4cc8-af5e-01e5a8533627","resolution":{"observed_at":"2026-08-16T00:25:58.130847Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.133269Z","title":null,"venue":null,"work_id":null,"year":2015},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":14,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.133269Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:59238938e41c757fd8d8ba05b497202aa836d5e67618f8ab417b41567610e22a","observation_id":"684d953e-d483-4da8-a445-b99ca7ef8d25","resolution":{"observed_at":"2026-08-16T00:25:58.133269Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":{"arxiv_id":"2308.01505","last_updated":"2023-12-07T02:37:02Z","snapshot_observed_at":"2026-08-20T12:31:23.001535Z","submitted_at":"2023-08-03T02:12:25Z","title":"The Million Quasars (Milliquas) Catalogue, v8","version":3},"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":"2308.01505","snapshot_observed_at":"2026-08-16T00:25:58.135642Z","title":null,"venue":null,"work_id":null,"year":2023},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":15,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.135642Z"},"links":{"cited_paper":"/paper/2308.01505","citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:954f0782471c89d9c9070289fbb71de475c46434fa6b868c6440cb61bcb4cdbb","observation_id":"2fac7228-5adf-417e-aad3-cfcfb9b4b4b8","resolution":{"observed_at":"2026-08-16T00:25:58.135642Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.138518Z","title":null,"venue":null,"work_id":null,"year":2002},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":16,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.138518Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:70837c91b15c826a8e3ccce88116695ae7ae1935cf17696d51885c0195ff8324","observation_id":"4ee0c4cb-3d3c-495e-ba31-ddb21806a56e","resolution":{"observed_at":"2026-08-16T00:25:58.138518Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.140923Z","title":"J., Djorgovski, S","venue":null,"work_id":null,"year":2014},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":17,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.140923Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:7f039649fa95cf15804b3ca94541d6cbba75408dfd58994edb30f12e7a31b213","observation_id":"6977700d-c0ae-4d1c-b737-074c44eca043","resolution":{"observed_at":"2026-08-16T00:25:58.140923Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.143390Z","title":"2025, A&A, 693, A319, doi: 10.1051/0004-6361/202450562","venue":null,"work_id":null,"year":2025},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":18,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.143390Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:db0639caac6b2dbf306955e1e2cf72f2244b97e7926531e990879ddf694e1eb6","observation_id":"399c3580-6ce8-4b33-a3b9-07f267c2dfff","resolution":{"observed_at":"2026-08-16T00:25:58.143390Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.146509Z","title":"P., Vogeley, M","venue":null,"work_id":null,"year":2015},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":19,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.146509Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:9438b32b108d1728b8ad60f5f741a62df6dceb8996263c321198afbb492b9553","observation_id":"fd7a4ac3-d92f-4464-8f22-986dd1e6b172","resolution":{"observed_at":"2026-08-16T00:25:58.146509Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.149350Z","title":"C., Bechtold, J., & Siemiginowska, A","venue":null,"work_id":null,"year":2009},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":20,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.149350Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:46207e4dc026a0fea6e6b8c85ab8092a42f6a05b244f2e6f019cbfb74c8e7249","observation_id":"851dd66a-4249-41d8-b35a-8f3b240e94aa","resolution":{"observed_at":"2026-08-16T00:25:58.149350Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.152426Z","title":"C., Becker, A","venue":null,"work_id":null,"year":2014},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":21,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.152426Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:fca783de323957acf917fb13a13fbbb9972be9fd1eb2900918baf0925ce57e4b","observation_id":"6d1fb2cc-2341-4d4d-bbfe-17d565262463","resolution":{"observed_at":"2026-08-16T00:25:58.152426Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":"10.1093/mnras/stad651","metadata_source":"doi_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.494272Z","title":"A., & Bian, F","venue":null,"work_id":"82d3c6e2-296a-40c9-80bb-e53a51b6a272","year":2023},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":22,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.155145Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:a60adee73943517e8c9166884f141fb6a60309359d776365dacc970dfa48ab09","observation_id":"1cd29e14-ec69-469d-b71e-d3f240524048","resolution":{"observed_at":"2026-08-16T00:25:58.496886Z","resolver_source":"doi","status":"verified_exact"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-08-21T06:32:19.484+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-08-21T06:32:19.484+00:00","source":"crossref"},{"observed_at":"2026-08-21T06:32:16.066871+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.157944Z","title":"1969, Nature, 223, 690, doi: 10.1038/223690a0","venue":null,"work_id":null,"year":1969},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":23,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.157944Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:ccff76e83743fefef592dd44dc8d9ed560928e4325b07986c64de38c664d2016","observation_id":"4ca7e22b-03c5-45d5-b37b-c98f9cf25932","resolution":{"observed_at":"2026-08-16T00:25:58.157944Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.160527Z","title":null,"venue":null,"work_id":null,"year":1997},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":24,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.160527Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:171e162cce493e6c559b4a310ea8b1e65d2076d9ef3eae81cb597ca2c3b327e3","observation_id":"56b7ec42-f409-4082-8f4c-2d9e62483967","resolution":{"observed_at":"2026-08-16T00:25:58.160527Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.163156Z","title":"L., Ivezi´ c,ˇZ., Kochanek, C","venue":null,"work_id":null,"year":2010},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":25,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.163156Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:d77edb1726858bc8ca0f407c5056194d470dcfc3a5fda63fcf02fff82af3aa3f","observation_id":"86db506a-1983-49b5-b807-31df5356bb14","resolution":{"observed_at":"2026-08-16T00:25:58.163156Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.166079Z","title":null,"venue":null,"work_id":null,"year":1922},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":26,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.166079Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:97260447b664012908b0d186b066caf7b1b8b89faa38ebce63d24baac3324698","observation_id":"344c440a-42c7-4175-9be3-fa845b8df6a5","resolution":{"observed_at":"2026-08-16T00:25:58.166079Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":"10.3847/2515-5172/ae6648","metadata_source":"doi_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.475958Z","title":null,"venue":null,"work_id":"5e2c6af5-b583-4981-a415-f21deff0fc82","year":1925},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":27,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.168502Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:6097ced37e65270389510d007e4d1c557e2c1fc321eac7b7c24146c11d916711","observation_id":"2ecd2ffd-cfe8-4fe4-80fc-2d0fc431aaa5","resolution":{"observed_at":"2026-08-16T00:25:58.478907Z","resolver_source":"doi","status":"verified_exact"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-08-21T06:32:19.484+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-08-21T06:32:19.484+00:00","source":"crossref"},{"observed_at":"2026-08-21T06:32:16.066871+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.170857Z","title":"J., Laher, R","venue":null,"work_id":null,"year":2019},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":28,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.170857Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:8f5ea052fdc005771e44efd5342d672c989319ae586b388ab700519ae95ccd67","observation_id":"be522995-880a-4f46-bbf9-f10f2cc5e3bf","resolution":{"observed_at":"2026-08-16T00:25:58.170857Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.173753Z","title":"A., & Sandage, A","venue":null,"work_id":null,"year":1963},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":29,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.173753Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:19034c63796b295039fa8de943284dfcd126f549765910baf4d0a34ed502ade3","observation_id":"5c21983b-e3b5-42e2-b09e-212764aa2d5b","resolution":{"observed_at":"2026-08-16T00:25:58.173753Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":"10.1177/001316446002000106","metadata_source":"doi_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.363018Z","title":null,"venue":null,"work_id":"dc727709-d64d-4c26-a530-f7f489efea2f","year":1960},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":30,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.176712Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:e3fa9581a743c25f5091dc12e72bf31329e22d846f510f2dd3abe8db3402349a","observation_id":"74846d69-88bb-4b3e-a955-4281d925d521","resolution":{"observed_at":"2026-08-16T00:25:58.365552Z","resolver_source":"doi","status":"verified_exact"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-08-21T06:32:19.484+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-08-21T06:32:19.484+00:00","source":"crossref"},{"observed_at":"2026-08-21T06:32:16.066871+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":"10.1007/978-1-4614-3520-4","metadata_source":"openalex","pith_arxiv_id":null,"snapshot_observed_at":"2026-08-17T11:03:46.409680Z","title":null,"venue":"Lecture notes in statistics","work_id":"beb387e8-5351-4a84-9789-5b2ed89287b6","year":2012},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":31,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.179446Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:a592c451a438ef0e62a5e8d082a5cd0637186f43196119c534431f25fa5b479d","observation_id":"964b4009-4706-46f9-8728-f362b8a7c810","resolution":{"observed_at":"2026-08-16T00:25:58.358044Z","resolver_source":"doi","status":"verified_exact"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-08-21T06:32:19.484+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-08-21T06:32:19.484+00:00","source":"crossref"},{"observed_at":"2026-08-21T06:32:16.066871+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.182347Z","title":"S., Richards, G","venue":null,"work_id":null,"year":2019},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":32,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.182347Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:826b0d707ef1fbd4fb7edb85d21f1418ff80f38be19d97566cae3f74713fc99e","observation_id":"67aca9e0-2d47-4044-a757-f31acf9f26a3","resolution":{"observed_at":"2026-08-16T00:25:58.182347Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.184891Z","title":"2011, ApJL, 743, L12, doi: 10.1088/2041-8205/743/1/L12","venue":null,"work_id":null,"year":2011},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":33,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.184891Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:618fbcc9141bbee3597c0b7b128a9ee4112178701580f80faaaf80122070ad58","observation_id":"78363ce5-3b7a-4e32-88c8-0df804be4a75","resolution":{"observed_at":"2026-08-16T00:25:58.184891Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.187681Z","title":"2015, ARA&A, 53, 365, doi: 10.1146/annurev-astro-082214-122302","venue":null,"work_id":null,"year":2015},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":34,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.187681Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:a5dc80329a8bf55918dfba7a5b16d8898f77f67fddea6d059f3a7b3c8d373df9","observation_id":"c3e8f757-d589-4f4b-a849-13b7825cc1ed","resolution":{"observed_at":"2026-08-16T00:25:58.187681Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.190453Z","title":"2022, MNRAS, 509, 2637, doi: 10.1093/mnras/stab3133","venue":null,"work_id":null,"year":2022},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":35,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.190453Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:cc12cfb4f1a8228c370f82e8f1c5420b853f4308f6f2ebf57b3484e570d46e9c","observation_id":"c6fceb94-6abc-4e4a-a49c-9742de11eb44","resolution":{"observed_at":"2026-08-16T00:25:58.190453Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.193281Z","title":null,"venue":null,"work_id":null,"year":2022},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":36,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.193281Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:1749194e217b4490ce4fa3e2c556d4e5ef0f7e6b83489945f49be110dab8fda3","observation_id":"45ea6c54-2177-4d53-935f-6eaadfa666d1","resolution":{"observed_at":"2026-08-16T00:25:58.193281Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.196433Z","title":"A., Bian, F., Fan, X., et al","venue":null,"work_id":null,"year":2020},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":37,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.196433Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:76e929ee5593896fc7892e7059371f027a1474797952c97d98718042caa42f95","observation_id":"84509941-fbbc-45e5-99a0-0b25113d54cd","resolution":{"observed_at":"2026-08-16T00:25:58.196433Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":"10.1088/0004-637x/811/2/95","metadata_source":"doi_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.326732Z","title":"M., Richards, G","venue":null,"work_id":"7fced2cd-c04b-479d-a339-9f372b097e0a","year":2015},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":38,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.199039Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:e254580bc4f930cf913f4799f520d00a3826f31ec336c9f8a1de5730932a3494","observation_id":"e1da64d7-6a8a-44a2-b2d9-0c7692af5fdf","resolution":{"observed_at":"2026-08-16T00:25:58.329180Z","resolver_source":"doi","status":"verified_exact"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-08-21T06:32:19.484+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-08-21T06:32:19.484+00:00","source":"crossref"},{"observed_at":"2026-08-21T06:32:16.066871+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.201736Z","title":"M., Foltz, C","venue":null,"work_id":null,"year":1982},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":39,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.201736Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:3a6426808d14fb15411de8bec2e861b597a560a44d121c834c81c9d2d77b4cb9","observation_id":"985248d8-dc66-4d1c-b13c-9a8719cddc8d","resolution":{"observed_at":"2026-08-16T00:25:58.201736Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.204537Z","title":"T., Myers, A","venue":null,"work_id":null,"year":2015},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":40,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.204537Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:e5b2c041ba9a972225f0977d03ff7d3df5f129c278e1a63dda3b4bc33556f783","observation_id":"2fd4b7d6-9acb-4d72-a0f6-90af780ba3a4","resolution":{"observed_at":"2026-08-16T00:25:58.204537Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":"10.1088/0004-637x/731/2/97","metadata_source":"doi_reference","pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.311561Z","title":"L., Koo, D","venue":null,"work_id":"a22474df-1b41-47e7-9afc-da5d552895cd","year":2011},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":41,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.207144Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:60fbf9c5c16ef1e317700a689974df327a08053c22371a215ef4fafb18901f15","observation_id":"47d3c2e0-71b8-4fc9-bc08-039670fe3316","resolution":{"observed_at":"2026-08-16T00:25:58.314386Z","resolver_source":"doi","status":"verified_exact"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-08-21T06:32:19.484+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-08-21T06:32:19.484+00:00","source":"crossref"},{"observed_at":"2026-08-21T06:32:16.066871+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":{"arxiv_id":"2507.07093","last_updated":"2025-07-09T17:51:37Z","snapshot_observed_at":"2026-08-17T20:55:48.438944Z","submitted_at":"2025-07-09T17:51:37Z","title":"The Nineteenth Data Release of the Sloan Digital Sky Survey","version":1},"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":"2507.07093","snapshot_observed_at":"2026-08-16T00:25:58.210122Z","title":"2025, arXiv e-prints, arXiv:2507.07093, doi: 10.48550/arXiv.2507.07093","venue":null,"work_id":null,"year":2025},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":42,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.210122Z"},"links":{"cited_paper":"/paper/2507.07093","citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:7bba4d12ae53851e0f5c817279610a1851f34a4e5fdc6cdcd91c2401f711b91a","observation_id":"aeaf5a36-05ad-44f0-b168-b94e62c9ddca","resolution":{"observed_at":"2026-08-16T00:25:58.210122Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.212919Z","title":null,"venue":null,"work_id":null,"year":1999},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":43,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.212919Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:6d13afb5df90a960925d11ca69b78a0c14d20d699acaaf089f8a40b99805b8a1","observation_id":"f29c4630-ed2d-4a27-a8e6-e7a64c4b86ce","resolution":{"observed_at":"2026-08-16T00:25:58.212919Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":{"arxiv_id":"astro-ph/9801013","last_updated":"1998-01-04T02:19:34Z","snapshot_observed_at":"2026-07-07T01:19:30.898449Z","submitted_at":"1998-01-04T02:19:34Z","title":"Quasars and Galaxy Formation","version":1},"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":"astro-ph/9801013","snapshot_observed_at":"2026-08-16T00:25:58.215529Z","title":null,"venue":null,"work_id":null,"year":1998},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":44,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.215529Z"},"links":{"cited_paper":"/paper/astro-ph/9801013","citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:e69b0e1d214f27e3fe05a82ec8d41e4bac22b2f5b76850d7d2b7b38b6d4bad11","observation_id":"3127602c-7506-47a0-9ee6-8a9c5ff87f1b","resolution":{"observed_at":"2026-08-16T00:25:58.215529Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.218424Z","title":"H., Cordes, J","venue":null,"work_id":null,"year":1984},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":45,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.218424Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:d76a69160b5846e213e4729a233a2889f0fe1185cbb090b1d017fd04cb28467b","observation_id":"056fa554-80d6-41e1-a8e2-e306a8170374","resolution":{"observed_at":"2026-08-16T00:25:58.218424Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.221046Z","title":null,"venue":null,"work_id":null,"year":1961},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":46,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.221046Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:835bb972b0cd449a37c5278137187f0d7b4f0db8e9c9bc8cf4fc04a3c7852ad6","observation_id":"88c178df-4073-487c-becd-e0c8ba9fc2b8","resolution":{"observed_at":"2026-08-16T00:25:58.221046Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.223589Z","title":null,"venue":null,"work_id":null,"year":2012},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":47,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.223589Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:b74710a43bf877d09b0d8a8e91470411d675aabecf886e6216ba2c62f8d24ba5","observation_id":"d35b7f07-b438-41c2-b581-f29332c9f891","resolution":{"observed_at":"2026-08-16T00:25:58.223589Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.226924Z","title":"J., et al","venue":null,"work_id":null,"year":2018},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":48,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.226924Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:c145cb0ae3508ab60a409bcb0b9ebcfd75e1e36be7e9ee577e61b2ed1416acb2","observation_id":"5efbbf7e-8e3e-4a30-b9c8-958d0fae3387","resolution":{"observed_at":"2026-08-16T00:25:58.226924Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.230568Z","title":null,"venue":null,"work_id":null,"year":2005},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":49,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.230568Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:cc3f5b145022aec7b32a036bff62eeb3acee1ab4ccb79fee2ce33d7cde532aed","observation_id":"1c4bd098-9347-42a2-8ecc-028d1f960bca","resolution":{"observed_at":"2026-08-16T00:25:58.230568Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.232998Z","title":null,"venue":null,"work_id":null,"year":1997},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":50,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.232998Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:39967b4199d7a80a764d306dab8fbcc06b4a1886efe7e57cccf7483569d03bdb","observation_id":"3fee986a-883f-40e5-bb29-c3420322fb3c","resolution":{"observed_at":"2026-08-16T00:25:58.232998Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.235994Z","title":"S., & Uttley, P","venue":null,"work_id":null,"year":2003},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":51,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.235994Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:c78bd1e1c6797d6bba0002f8f5cce4375c9c05960a27d72f7e9759e8d747b055","observation_id":"1cf7fb89-50a6-425d-8b89-d45498ac044c","resolution":{"observed_at":"2026-08-16T00:25:58.235994Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.238663Z","title":"A., et al","venue":null,"work_id":null,"year":2024},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":52,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.238663Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:27d339db1168b472ec21e9c73fc02feb23ca7ddfc12ca506f74f38d11d70c73f","observation_id":"46944e5f-4173-4390-b038-931000093791","resolution":{"observed_at":"2026-08-16T00:25:58.238663Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":"10.1002/9780470382776.ch3","metadata_source":"openalex","pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T11:08:47.750906Z","title":"2008, Hierarchical Clustering, 31–62, doi: https://doi.org/10.1002/9780470382776.ch3","venue":null,"work_id":"3387771c-11f1-4862-8493-9cfc6a6c0c88","year":2008},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":53,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.241522Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:99881b0e8bb63bf1427872e1b19db5c283683abc5ce76fd8753d7d1d83944e9b","observation_id":"7c2ebdf3-b1f6-4486-86a4-7332cdb422fc","resolution":{"observed_at":"2026-08-16T00:25:58.279513Z","resolver_source":"doi","status":"verified_exact"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-08-21T06:32:19.484+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-08-21T06:32:19.484+00:00","source":"crossref"},{"observed_at":"2026-08-21T06:32:16.066871+00:00","source":"retraction_watch"}],"state":"measured"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.244740Z","title":"G., Adelman, J., Anderson, Jr., J","venue":null,"work_id":null,"year":2000},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":54,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.244740Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:67e12c832b9b8bfedf6349031f951c3330d31590b4b1dedafd2fa301d28019e5","observation_id":"3c938864-669c-4038-800f-12dd93093959","resolution":{"observed_at":"2026-08-16T00:25:58.244740Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}},{"citation":{"cited_paper":null,"cited_work":{"arxiv_id":null,"doi":null,"metadata_source":null,"pith_arxiv_id":null,"snapshot_observed_at":"2026-08-16T00:25:58.248074Z","title":"S., Koz lowski, S., & Udalski, A","venue":null,"work_id":null,"year":2013},"citing_paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum","version":1},"reference_index":55,"source":"pdf_text","source_observed_at":"2026-08-16T00:25:58.248074Z"},"links":{"citing_paper":"/paper/2608.11916"},"observation_digest":"sha256:5c2f9b69fb7c1d35fa7a50dce0a2c4fca05953786348a204446a5a230ae70f98","observation_id":"75b0cb51-60f1-47ff-9fcc-48d276183474","resolution":{"observed_at":"2026-08-16T00:25:58.248074Z","resolver_source":null,"status":"unresolved"},"standing_notice":{"events":[],"reason":"canonical_work_link_unavailable","source_receipts":[],"state":"unavailable"}}],"paper":{"arxiv_id":"2608.11916","last_updated":"2026-08-12T10:49:51Z","latest_version":1,"primary_category":"astro-ph.GA","snapshot_observed_at":"2026-08-19T15:48:16.836058Z","submitted_at":"2026-08-12T10:49:51Z","title":"Classifying Quasar Types Without a Spectrum"},"reference_resolution":{"displayed":55,"state_counts":{"malformed_identifier":0,"metadata_mismatch":0,"parse_uncertain":0,"unresolved":48,"verified_exact":7,"verified_fuzzy":0},"total_outbound_references":55},"refusal":"A citation records a reference. It does not transfer a finding from one paper to another.","schema":"pith.paper-citation-record.v1","standing_sources":[{"observed_at":"2026-08-21T06:32:19.484+00:00","source":"crossref"},{"observed_at":"2026-08-21T06:32:16.066871+00:00","source":"retraction_watch"}],"thesis":"As of 21 August 2026, this Paper Citation Record lists 55 of 55 outbound references and 0 inbound Pith citation observations for arXiv:2608.11916."}