Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links, observed 2026-08-14T06:19:11.664279Z
Paper Citation Record · LEDGER
As of 16 August 2026, this Paper Citation Record lists 27 of 27 outbound references and 0 inbound Pith citation observations for arXiv:1909.00223.
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 2026-08-14T06:19:11.664279Z
One-hop event checks from named stored sources.
Source: scholarly_work_events, retraction_status_cache, observed 2026-08-16T06:30:59.297886+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
27 of 27 outbound references displayed
External citation measurements
No source-named external measurement is stored.
Observation fad94f59-2fdb-4b9c-b7c4-0087be4222d2 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Ackerman
Reference 1
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 61d533c5-cff4-4955-b3f5-6c4509dee819 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar On topological graphs with at most four crossings per edge
Reference 2
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation a403fdd9-04cf-4775-b096-193f8b6d6c2f · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Ackerman, J
Reference 3
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation a33097fe-f7dd-4092-9192-9efc42c8b50e · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Ackerman and G
Reference 4
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation aee0cef5-7478-4025-8417-65f28946a5e7 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Unresolved cited work
Reference 5
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 820165ce-e63a-425d-a537-ee2310df1e52 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Angelini, M
Reference 6
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 9df34d7e-13cc-476f-9a0c-c634d8534fca · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Unresolved cited work
Reference 7
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation c194b70e-4b86-4e7b-ac3e-5d8c10081d30 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Unresolved cited work
Reference 8
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation f87fd407-9044-4879-a869-d90f1be20d9b · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Unresolved cited work
Reference 9
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 8c444336-11a8-4818-87c5-6ff2cdedbc63 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Binucci, M
Reference 10
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation c7e26ce3-d7f6-4d5b-91cb-b6bd6969d804 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Binucci, E
Reference 11
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 130bb9f5-c779-4084-9c57-28752f1b3af2 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Unresolved cited work
Reference 12
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation abdda6e7-4132-4d2b-8fd4-235847908015 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Capoyleas and J
Reference 13
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation cfa64f1b-72bf-474c-a8b1-0d54634a54ba · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Cheong, S
Reference 14
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 3ef91866-aad1-483a-ac68-31d977e3559f · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Didimo, G
Reference 15
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 1bafacad-445c-4248-a558-0c080b7cf33e · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Eades and G
Reference 16
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation c7ff6714-dc34-4aee-af82-32bf05884930 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Fox and J
Reference 17
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation fa7dcf76-0bb5-4906-840e-9c20e4aec20a · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Unresolved cited work
Reference 18
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 16932d05-3c12-426a-9bde-f15d29aacebd · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Hoffmann and C
Reference 19
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation d8420398-ecc9-4628-a9bc-91a6640cb016 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar The Density of Fan-Planar Graphs
Reference 20
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 71f15326-90eb-4401-a49c-ace414454b03 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Unresolved cited work
Reference 21
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 533a6c82-0297-47d5-a84b-1e9dbf271fe8 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Unresolved cited work
Reference 22
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation de1b38ee-752a-4701-b60c-2a11a0f895e0 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Unresolved cited work
Reference 23
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 47642e5f-af45-4949-bb3a-565966da4001 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Unresolved cited work
Reference 24
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation 682a500a-23fc-411f-9e4d-99139a313f86 · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Pach and G
Reference 25
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation ee5e8531-74d9-4060-a0c3-953b6262a44a · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Suk and B
Reference 26
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
Observation cadba79d-7f17-49a3-b142-1c9f2e3cf45d · outbound
Simple $k$-Planar Graphs are Simple $(k+1)$-Quasiplanar Unresolved cited work
Reference 27
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-16T06:30:59.297886+00:00.
No inbound Pith citation observations are available.