Unresolvable Identifier

arXiv:2605.02242 · detector doi_compliance · cross_source · 2026-05-19 16:31:46.687282+00:00

critical doi_compliance unresolvable_identifier

Identifier '10.4153/s0008414x21000334' 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

Lupini, Martino , title =. Canadian Journal of Mathematics , year =. doi:10.4153/S0008414X21000334 , eprint =

Evidence payload

{
  "arxiv_id": null,
  "checked_sources": [
    "crossref_by_doi",
    "openalex_by_doi",
    "doi_org_head"
  ],
  "doi": "10.4153/s0008414x21000334",
  "raw_excerpt": "Lupini, Martino , title =. Canadian Journal of Mathematics , year =. doi:10.4153/S0008414X21000334 , eprint =",
  "ref_index": 11,
  "verdict_class": "cross_source"
}