Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links
Paper Citation Record · LEDGER
As of 7 August 2026, this Paper Citation Record lists 0 of 0 outbound references and 4 inbound Pith citation observations for arXiv:2104.14221.
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
One-hop event checks from named stored sources.
Source: scholarly_work_events, retraction_status_cache, observed 2026-08-07T06:34:17.273281+00:00
Pith citing papers itemized under the disclosed page cap.
Source: paper_references, paper_reference_links, observed 2026-08-06T04:53:32.326135Z
A source-named dated measurement, never combined with another source.
Source: arxiv_reference, observed 2026-07-02T14:17:03.252252Z
0 of 0 outbound references displayed
External citation measurements
No source-named external measurement is stored.
No outbound reference observations are available for this paper version.
Observation 3b1f7fc3-73bc-4af9-9eb5-9ffc54caba75 · inbound
Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A$^*$ The observer-dependent shadow of the Kerr black hole
Reference 213
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-07T06:34:17.273281+00:00.
Observation d99edb80-eb2f-4429-880c-19ed57cd9553 · inbound
Optical Characteristics of the Kerr-Bertotti-Robinson Black Hole The observer-dependent shadow of the Kerr black hole
Reference 20
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 009e9792-701a-42aa-acb4-f5167c6f9345 · inbound
Critical Behavior of Photon Rings in Kerr-Bertotti-Robinson Spacetime The observer-dependent shadow of the Kerr black hole
Reference 44
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 600e8c05-37ee-4a4e-a16c-e2f9d74bbd5b · inbound
Detectability of secondary images from flares near Sgr A* with mock GRAVITY data The observer-dependent shadow of the Kerr black hole
Reference 13
Source-reported events for the cited work
No event found in the named queried sources as of 2026-08-07T06:34:17.273281+00:00.