Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-08-11T22:40:35.941339Z
Paper Citation Record · LEDGER
As of 23 August 2026, this Paper Citation Record lists 73 of 73 outbound references and 0 inbound Pith citation observations for arXiv:2412.03265.
A citation records a reference. It does not transfer a finding from one paper to another.
Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-08-11T22:40:35.941339Z
One-hop event checks from named stored sources.
Source: scholarly_work_events, retraction_status_cache, observed 2026-08-23T06:30:58.430688+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
73 of 73 outbound references displayed
External citation measurements
No source-named external measurement is stored.
Observation 0724523a-a88a-45a8-92fa-6bafb7a0b7c5 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Sorlin and M.-G
Reference 1
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 5f80640b-9f9b-412f-8b78-6188f01d5a4a · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces N= 32isotones.Since theN= 32 subshell effect is weak forZ <20, it is worthwhile to discuss the structural char- acteristics of these isotones adjacent to theN= 34 magic number
Reference 2
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 0f351879-6ca9-482a-82c0-92ba33c510cc · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Hagen, M
Reference 3
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation ce1e0a1b-15ff-40d1-8067-b2a7bbcc8b08 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Hergert, S
Reference 4
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation cc47d6be-00c0-460b-9979-59fa800e6860 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 5
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 3e902ef9-cf60-4279-9a58-e1accf8d0a4a · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Otsuka, A
Reference 6
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation d877334c-7210-4ffb-984b-57172e9af3d9 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Xuet al., Phys
Reference 7
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 135b7cdc-0d52-4261-a4cf-e293094e881d · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Som` a, C
Reference 8
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 28918f1c-61b1-47ba-821d-04e78740fe86 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Steppenbecket al., Nature502, 207 (2013)
Reference 9
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation b6933da6-c5ef-4f6a-995b-e580e85c4444 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Steppenbecket al., Phys
Reference 10
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 8b29927d-c708-4692-9665-dbb2e26986aa · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Leistenschneideret al., Phys
Reference 11
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 050580d7-40bb-458e-a086-1b8e80438c0b · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Iimuraet al., Phys
Reference 12
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 46733dba-2101-43ce-926d-ac72196e57e9 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 13
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation f5008c98-5473-486f-86ab-433db9f381f2 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Rosenbuschet al., Phys
Reference 14
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 68a07ca6-7ec8-4a6a-9b67-7db07d439f45 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 15
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation d82a5ff0-2d08-41f5-b7b2-177c11ed3322 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Otsuka, T
Reference 16
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 74651200-6a91-4566-934f-65574165dc06 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 17
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 3f4d205b-d48e-448c-9461-b02a75a48d58 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Otsuka, R
Reference 18
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 5030407a-73f5-49bc-b178-3b21d376e37a · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Honma, T
Reference 19
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation b4aa25fa-3c34-4eb5-a28f-e1867aedeb72 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Honma, T
Reference 20
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 293a9be0-43f8-4aea-9a22-15bd74f8104f · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Honma, T
Reference 21
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation f2744a41-d1c6-4634-be3a-e35cd1f621e9 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Utsuno, Physics4, 185 (2022)
Reference 22
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 699c966b-4839-47dd-83bc-be9f945945e6 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Otsuka, T
Reference 23
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation eca6bd5c-976e-4997-a024-62e2c2ec1cfd · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 24
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation ee9496fc-556a-444c-8fa9-88c6edac018a · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Dikmen, A
Reference 25
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 1c7dacce-f9a8-4c79-9471-555c9e259009 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 26
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 44868631-7106-4935-9188-0f2ee520b873 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 27
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 10eb93e4-e86b-417f-a1fb-ffab7a810f82 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 28
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation fb2024d7-ff10-4e10-b9ad-d1b20fbc3b11 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 29
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation f0d7e7a2-7a0b-423e-9bba-72fe96f84ff0 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 30
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 2ca3cd7a-56f0-4832-be7d-6360e9549fea · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 31
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation c06a8e91-eafb-4c3e-ae9c-9ee006e395d5 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Hergert, S.K
Reference 32
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 4f913464-08a1-4853-95e0-ce107a21045c · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 33
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 3554a4be-3702-4788-9ea8-045c52e75420 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Sarma and P
Reference 34
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation ca8bf870-332e-4c86-9318-2f5f613b5f39 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 35
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 025ba89b-4436-42a6-be40-efce11db4ef6 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 36
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 63eb8a77-62f1-43b7-9515-0cb92b67d406 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 37
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 5a5e7332-d4cd-49ed-aca8-7edd1424f7c0 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Sahoo, P
Reference 38
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 2f8ca84b-f6ad-431a-87e7-90198087f830 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 39
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 5bb3d00d-243b-4dd3-b89f-36fb64c28e85 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Tichai, K
Reference 40
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation ae73ed59-b1a4-4fc9-a3f1-4f1f7616aa05 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Miyagi, S
Reference 41
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation c769508b-0c76-48f7-8d4a-dec9e723b6a6 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 42
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 62bc1edc-1ff4-445e-b38f-5a7d12a99102 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Miyagi, S
Reference 43
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 636ac4ad-8bbe-4dc3-b29a-311707be0f52 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 44
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation d8a8fc61-eb35-43dc-857b-dd2557fb3073 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Yuan and B.S
Reference 45
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 2dbfcb94-e051-4c9c-a793-9bee0185758a · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 46
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation f0e76fa5-9aa7-445a-b7be-3fc5d30eaec3 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Sahoo and P.C
Reference 47
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 272e3e1b-f812-42d6-a6c7-f372ae7b7c9e · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Yuan, J.G
Reference 48
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation d548360e-8b49-4fb5-8805-088b9fadbe87 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Hebeler, V
Reference 49
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation cf01c87a-3aa8-423c-ae5e-c9d9e6e37e7a · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Hebeler, S
Reference 50
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 067c1a55-8a87-41f4-8ba4-ef2701d83caa · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Simonis, K
Reference 51
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation fcf6f4ae-a1fb-41bb-b668-a96035c428a5 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Shimizu, T
Reference 52
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation f7c97df4-fb23-4035-a692-5b56390eed39 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 53
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 9a683a75-9f9d-4524-9144-7bdfa11dad0a · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 54
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation cbf9e55f-6c5a-42b4-b878-b700d162d18c · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Nevertheless, the overall systematic trends of the 2 + 1 states are well reproduced within VS- IMSRG calculations
Reference 55
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation a3db1231-21bc-4974-8216-a90d3db8ae42 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 56
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 2f49fc68-6167-4f7a-9141-6e23a08f9a1b · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Heinz, T
Reference 57
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation f2e39686-5fc7-45fa-9117-0d511f2a05ec · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 58
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 5356e508-7710-4276-b4e2-2e076604e7fa · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 59
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 839e28ac-b4ef-4ad0-bc94-68c9b3e250ad · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 60
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 01fc3379-f82f-4a35-9e57-f0370eaae6d8 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 61
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation a7a32df4-de08-4b6a-a8e6-8624b33b9894 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Duguet, and G
Reference 62
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation d96d2428-ed3e-4ab9-b5ed-95a238ad3a67 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Duguet, H
Reference 63
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation c0019cc2-ef99-4232-830e-d1a139d175d3 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Som` a and T
Reference 64
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 01b59b91-ee83-4e4d-8480-766a20c812be · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 65
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 74a69b03-ff8f-475b-8474-176cf4262c8e · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Yoro, Nucl
Reference 66
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 2a1b72e8-45f4-4e05-9faa-e688471d10bd · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 67
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation c15cb5a8-4615-44d8-94f8-cc81f1c8fbd6 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 68
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 004e9e2c-0cb2-4e76-b972-6d8edd84dd0d · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Tsunoda, T
Reference 69
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 378b03c3-d0b2-45df-a350-4cb5cf3c41e7 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Tsunoda, T
Reference 70
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 419bdb78-986e-464e-a0f2-fcef5d9e6dee · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Hendersonet al., Phys
Reference 71
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 92786527-c438-4dc4-b97e-713727234c94 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Unresolved cited work
Reference 72
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-23T06:30:58.430688+00:00.
Observation 136f0b95-04cb-4398-8dba-d8cc2aabdf03 · outbound
Evolution of shell structure at $\mathbf{N=32}$ and 34: Insights from realistic nuclear forces Miyagi, Eur
Reference 73
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
No inbound Pith citation observations are available.