Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-08-10T20:54:14.916919Z
Paper Citation Record · LEDGER
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE
As of 23 August 2026, this Paper Citation Record lists 50 of 50 outbound references and 0 inbound Pith citation observations for arXiv:2501.07081.
A citation records a reference. It does not transfer a finding from one paper to another.
Coverage vector
One-hop event checks from named stored sources.
Source: scholarly_work_events, retraction_status_cache, observed 2026-08-22T06:32:14.747728+00:00
Pith citing papers itemized under the disclosed page cap.
Source: paper_references, paper_reference_links
A source-named dated measurement, never combined with another source.
Source: cited_works
Reference resolution
50 of 50 outbound references displayed
- verified exact1
- verified fuzzy6
- unresolved41
- parse uncertain0
- malformed identifier2
- metadata mismatch0
External citation measurements
No source-named external measurement is stored.
Outbound references
Observation 92d8a51e-868d-4dc3-b7aa-07e8167f231e · outbound
This paper cites It has been widely used in clinical diagnosis and research at 1.5T and 3T.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE It has been widely used in clinical diagnosis and research at 1.5T and 3T
Reference 1
- Resolution
- verified fuzzy
- raw_fallback, observed 2026-08-10T20:54:16.416292Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 7fd911ba-db32-4a8e-8522-ef3d457bb8fe · outbound
This paper cites Figure 1 shows its timing diagram.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Figure 1 shows its timing diagram
Reference 2
- Resolution
- malformed identifier
- raw_fallback, observed 2026-08-10T20:54:16.390520Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 6637eaf8-c5c1-4542-8634-f7ccb416008a · outbound
This paper cites The spin-echo T1 values were averaged within each ROI to obtain a reference T 1 value (𝑇1 𝑟𝑒𝑓) for each tube.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE The spin-echo T1 values were averaged within each ROI to obtain a reference T 1 value (𝑇1 𝑟𝑒𝑓) for each tube
Reference 3
- Resolution
- verified fuzzy
- raw_fallback, observed 2026-08-10T20:54:16.366620Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation b27011fe-ff06-4655-82ea-3e3b3adb45e7 · outbound
This paper cites Figure 3(a) illustrates the T1 errors in the estimations obtained by mIR-rt under different InvEs and T 1 values.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Figure 3(a) illustrates the T1 errors in the estimations obtained by mIR-rt under different InvEs and T 1 values
Reference 4
- Resolution
- verified fuzzy
- raw_fallback, observed 2026-08-10T20:54:16.341533Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation bee54e29-e660-4457-9aad-7d2b7c0492b3 · outbound
This paper cites The T1 value obtained from the new method is in good agreement with the value obtained using the standard IR-SE sequence in the phantom study.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE The T1 value obtained from the new method is in good agreement with the value obtained using the standard IR-SE sequence in the phantom study
Reference 5
- Resolution
- verified fuzzy
- raw_fallback, observed 2026-08-10T20:54:16.318017Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 0e390866-cad8-4874-8015-9537ec7a8fce · outbound
This paper cites And this study reports myocardial T 1 values at 5T for the first time.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE And this study reports myocardial T 1 values at 5T for the first time
Reference 6
- Resolution
- verified fuzzy
- raw_fallback, observed 2026-08-10T20:54:16.297701Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 0155d3d9-fd83-4be6-b1bd-2b27a8691e17 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 7
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:16.277691Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 9a0e8bc3-1aa6-4c12-8114-bc23001f9dfd · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 8
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:16.256752Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 4e9bda29-d18b-473e-b461-3983d22d5f2f · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 9
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:16.235197Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation eda0ee83-36fb-4dba-8a59-3041e069b457 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 10
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:16.208684Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation b8a2b11d-3651-4ce8-b065-6e9e6744fb01 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 11
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:16.181521Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation e2fb50e3-13f5-498f-abc5-ec9f633796e7 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 12
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:16.157921Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 0d274c94-5912-47a8-9dec-bdf07fd2b107 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 13
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:16.136436Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 66684e4f-c3db-4b08-a131-33aaca71d4d1 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 14
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:16.106643Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 9e4e9375-c2bc-44e1-b358-18b135340dff · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 15
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:16.075774Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation af94aeaf-53c1-4414-9aed-e30d2e4e6878 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 16
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:16.050677Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 442b0e8c-c10a-47c8-968c-cd5a504b2217 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 17
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:16.025864Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation dba899be-3548-4102-bee9-7afe0d594a4e · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 18
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.982776Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 94d0d54c-44ad-4b2e-a1d8-7c16a748729e · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 19
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.963705Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation d02d5b0d-1d78-4beb-9e88-dc760fd97b75 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 20
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.943624Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 44ee6245-9ac4-4f79-8833-bd54529a7571 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 21
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.907617Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation d3ff8d04-7c79-4b95-962c-eb16ebc04132 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 22
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.871634Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 8108fe05-428a-48d0-8b7d-3c63f6aed96f · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 23
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.848826Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation fe6556dd-18aa-43c0-a354-11b35f9e412d · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 24
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.824373Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation d576a938-cc5d-4aec-b3db-e7eb7d6cbe0c · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 25
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.804109Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation e9b84a7f-c140-4328-8783-5710f48284c2 · outbound
This paper cites RS-MOCO: A deep learning-based topology-preserving image registration method for cardiac T1 mapping.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE RS-MOCO: A deep learning-based topology-preserving image registration method for cardiac T1 mapping
Reference 26
- Resolution
- verified exact
- local_arxiv, observed 2026-08-10T20:54:14.993225Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 0d11654b-b1a1-4c72-b2bc-4bb4e6e4f72d · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 27
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.776762Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 4f48d3fb-9e43-4d70-b7ba-6091eca33390 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 28
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.752426Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation e0a9ada1-8d6e-40cd-8076-ff3e82ce3728 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 29
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.725878Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 869c329e-8af4-4105-bec3-36dfa7851c1d · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 30
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.697812Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 6ab9fa78-fda6-4bf4-9c8c-e9be0eddd5b2 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 31
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.665246Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation b04dacd1-b959-4677-9e8d-40737b23c012 · outbound
This paper cites Annual Meeting of ISMRM.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Annual Meeting of ISMRM
Reference 32
- Resolution
- verified fuzzy
- raw_fallback, observed 2026-08-10T20:54:15.635086Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation e9a46588-ff11-4ba5-a2e2-7065a1d2be38 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 33
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.610588Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation db4bfda6-9c66-4cfb-8099-e3a2826cc0f9 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 34
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.581579Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation ebb14a2e-ec8e-484c-9179-4eaf176a93f2 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 35
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.547520Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation e01034fe-9b22-4c6b-95dc-fd73d7789663 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 36
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.526248Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation e471766f-39b3-4be4-867f-7ce8a6696bce · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 37
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.498656Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 3f1641e4-9fe9-465d-9107-02c21b242d3c · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 38
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.470749Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 459a5c98-e4d6-44f9-b68c-b1015ca7f3af · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 39
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.444883Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 5d523531-278f-4398-b7db-08cb038df94e · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 40
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.416005Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 55ded382-c651-416e-8b27-3cf7c993410d · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 41
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.358373Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 31b197b1-db88-43a5-8a08-74c96188da1a · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 42
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.321653Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation c45d01ff-a76e-4110-96df-3f93a5d9f03f · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 43
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.290605Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 8e786262-c97b-4762-9605-0f1fa820b3cf · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 44
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.258425Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation b0423e9a-aacc-4d4a-a66f-f28ed642f9e6 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 45
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.216405Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 547e8ac4-50bc-42e7-8939-e457e4927efa · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 46
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.183147Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 10459d47-2d96-49b8-9bc9-e405c783ad5d · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 47
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.150551Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 23c317db-4c50-4cc5-a430-98a52a26738a · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 48
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.109305Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 0a43019e-ed6b-4eae-85e8-92a27fcaaf05 · outbound
This paper cites an unresolved cited work.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Unresolved cited work
Reference 49
- Resolution
- unresolved
- raw_fallback, observed 2026-08-10T20:54:15.063757Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Observation 7d172552-540a-4e7c-a98e-2e6e6eb8bd39 · outbound
This paper cites Ref (ms) Accuracy (ms) Precision No.
Myocardial T1 mapping at 5T using multi-inversion recovery real-time spoiled GRE Ref (ms) Accuracy (ms) Precision No
Reference 50
- Resolution
- malformed identifier
- raw_fallback, observed 2026-08-10T20:54:15.036107Z
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-22T06:32:14.747728+00:00.
Pith citing papers
No inbound Pith citation observations are available.