Typed states for the displayed outbound observations.
Source: paper_references, paper_reference_links
Paper Citation Record · LEDGER
NP-Hardness and Inapproximability of Sparse PCA
As of 22 August 2026, this Paper Citation Record lists 0 of 0 outbound references and 2 inbound Pith citation observations for arXiv:1502.05675.
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, observed 2026-08-04T07:21:52.383946Z
A source-named dated measurement, never combined with another source.
Source: cited_works
Reference resolution
0 of 0 outbound references displayed
- verified exact0
- verified fuzzy0
- unresolved0
- parse uncertain0
- malformed identifier0
- metadata mismatch0
External citation measurements
No source-named external measurement is stored.
Outbound references
No outbound reference observations are available for this paper version.
Pith citing papers
Observation f290c2be-d05d-41b1-8f91-c317b02bfd70 · inbound
Combinatorial Sparse PCA Beyond the Spiked Identity Model cites this paper.
Combinatorial Sparse PCA Beyond the Spiked Identity Model NP-Hardness and Inapproximability of Sparse PCA
Reference 244
- Resolution
- unresolved
- no resolver link, observed 2026-08-02T19:32:27.656591Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.
Observation 7a563f49-9e04-4e63-aa28-3faed6462b69 · inbound
Detecting high-dimensional entanglement with simple measurements cites this paper.
Detecting high-dimensional entanglement with simple measurements NP-Hardness and Inapproximability of Sparse PCA
Reference 26
- Resolution
- unresolved
- no resolver link, observed 2026-08-04T07:21:52.383946Z
Source-reported events for the cited work
Unavailable: canonical work link unavailable.