Unresolvable Identifier

arXiv:2604.21140 · detector doi_compliance · cross_source · 2026-05-20 01:18:45.535821+00:00

critical doi_compliance unresolvable_identifier

Identifier '10.5555/889566' 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

M.J. Fischer and M.S. Paterson. String matching and other products. In R.M. Karp, editor,Complexity of Computation, volume 7 ofSIAM-AMS Proceedings, pages 113–125. American Mathematical Society, 1974. URL:dspace.mit.edu/handle/1721.1/148870, doi:10.5555/889566

Evidence payload

{
  "arxiv_id": null,
  "checked_sources": [
    "crossref_by_doi",
    "openalex_by_doi",
    "doi_org_head"
  ],
  "doi": "10.5555/889566",
  "raw_excerpt": "M.J. Fischer and M.S. Paterson. String matching and other products. In R.M. Karp, editor,Complexity of Computation, volume 7 ofSIAM-AMS Proceedings, pages 113\u2013125. American Mathematical Society, 1974. URL:dspace.mit.edu/handle/1721.1/148870, doi:10.5555/889566",
  "ref_index": 17,
  "verdict_class": "cross_source"
}