{"as_of":"2026-08-18T18:13:00Z","caps":{"database_statements":6,"inbound":100,"outbound":100},"context_digest":"sha256:43bc4f8872416ad65b3b95ef0305ea4a0d29d8cbc0416db90acd3b2f456e39bd","coverage":[{"denominator":0,"lane":"reference_resolution","note":"Typed states for the displayed outbound observations.","records_observed":0,"source":"paper_references, paper_reference_links","source_observed_at":null,"state":"measured"},{"denominator":1,"lane":"standing_notices","note":"One-hop event checks from named stored sources.","records_observed":1,"source":"scholarly_work_events, retraction_status_cache","source_observed_at":"2026-08-18T06:34:40.430872+00:00","state":"measured"},{"denominator":1,"lane":"inbound_itemization","note":"Pith citing papers itemized under the disclosed page cap.","records_observed":1,"source":"paper_references, paper_reference_links","source_observed_at":"2026-08-16T12:04:02.849835Z","state":"measured"},{"denominator":1,"lane":"external_citation_measurements","note":"A source-named dated measurement, never combined with another source.","records_observed":0,"source":"pith","source_observed_at":"2026-08-16T12:04:03.099750Z","state":"measured"}],"external_citation_measurements":[],"inbound":[{"citation":{"cited_paper":{"arxiv_id":"2110.04671","last_updated":"2021-10-10T00:59:44Z","snapshot_observed_at":"2026-08-18T17:07:28.751781Z","submitted_at":"2021-10-10T00:59:44Z","title":"Classification of symmetry protected topological phases in quantum spin chains","version":1},"cited_work":{"arxiv_id":"2110.04671","doi":null,"metadata_source":"pith","pith_arxiv_id":"2110.04671","snapshot_observed_at":"2026-08-16T12:04:03.099750Z","title":"Classification of symmetry protected topological phases in quantum spin chains","venue":"math-ph","work_id":"621aecae-c883-4924-b6ca-5228b96c6d50","year":2021},"citing_paper":{"arxiv_id":"2504.14380","last_updated":"2025-09-05T12:02:55Z","snapshot_observed_at":"2026-08-18T01:24:56.948438Z","submitted_at":"2025-04-19T19:04:26Z","title":"Gauging Quantum Phases: A Matrix Product State Approach","version":2},"reference_index":23,"source":"pdf_text","source_observed_at":"2026-08-16T12:04:02.849835Z"},"links":{"cited_paper":"/paper/2110.04671","citing_paper":"/paper/2504.14380"},"observation_digest":"sha256:cf3b1403e1a3f9f4b75d7be0bb3eb3108f584091cfebb5ca114ca35a1182320f","observation_id":"481d6302-df2c-4680-9990-ec5c2ad3842b","resolution":{"observed_at":"2026-08-16T12:04:03.103987Z","resolver_source":"local_arxiv","status":"malformed_identifier"},"standing_notice":{"events":[],"observation":"No event found in the named queried sources as of 2026-08-18T06:34:40.430872+00:00.","reason":null,"source_receipts":[{"observed_at":"2026-08-18T06:34:40.430872+00:00","source":"crossref"},{"observed_at":"2026-08-18T06:34:34.496301+00:00","source":"retraction_watch"}],"state":"measured"}}],"links":{"evidence":"/evidence","html":"/paper/2110.04671/citation-record","integrity":"/paper/2110.04671/integrity","json":"/paper/2110.04671/citation-record.json","paper":"/paper/2110.04671"},"outbound":[],"paper":{"arxiv_id":"2110.04671","last_updated":"2021-10-10T00:59:44Z","latest_version":1,"primary_category":"math-ph","snapshot_observed_at":"2026-08-18T17:07:28.751781Z","submitted_at":"2021-10-10T00:59:44Z","title":"Classification of symmetry protected topological phases in quantum spin chains"},"reference_resolution":{"displayed":0,"state_counts":{"malformed_identifier":0,"metadata_mismatch":0,"parse_uncertain":0,"unresolved":0,"verified_exact":0,"verified_fuzzy":0},"total_outbound_references":0},"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":"2026-08-18T06:34:40.430872+00:00","source":"crossref"},{"observed_at":"2026-08-18T06:34:34.496301+00:00","source":"retraction_watch"}],"thesis":"As of 18 August 2026, this Paper Citation Record lists 0 of 0 outbound references and 1 inbound Pith citation observation for arXiv:2110.04671."}