Unresolvable Identifier

arXiv:2605.18996 · detector doi_compliance · cross_source · 2026-05-20 08:00:30.293626+00:00

critical doi_compliance unresolvable_identifier

Identifier '10.1007/s40879-022-00560-61' 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

J. Br¨ udern and R. C. Vaughan, Sums of two unlike powers in arithmetic progres- sions, European Journal of Mathematics (2022), to appear. https://doi.org/10.1007/s40879-022-00560-61

Evidence payload

{
  "arxiv_id": null,
  "checked_sources": [
    "crossref_by_doi",
    "openalex_by_doi",
    "doi_org_head"
  ],
  "doi": "10.1007/s40879-022-00560-61",
  "raw_excerpt": "J. Br\u00a8 udern and R. C. Vaughan, Sums of two unlike powers in arithmetic progres- sions, European Journal of Mathematics (2022), to appear. https://doi.org/10.1007/s40879-022-00560-61",
  "ref_index": 5,
  "verdict_class": "cross_source"
}