Unresolvable Identifier

arXiv:2604.22117 · detector doi_compliance · cross_source · 2026-05-20 00:15:05.817735+00:00

critical doi_compliance unresolvable_identifier

Identifier '10.1137/1.9781421407944' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. The cited work could not be located through any authoritative source.

Paper page Integrity report arXiv Try DOI

Evidence text

Matrix Computations , author =. 2013 , publisher =. doi:10.1137/1.9781421407944 , url =

Evidence payload

{
  "arxiv_id": null,
  "checked_sources": [
    "crossref_by_doi",
    "openalex_by_doi",
    "doi_org_head"
  ],
  "doi": "10.1137/1.9781421407944",
  "raw_excerpt": "Matrix Computations , author =. 2013 , publisher =. doi:10.1137/1.9781421407944 , url =",
  "ref_index": 89,
  "verdict_class": "cross_source"
}