Unresolvable Identifier

arXiv:2604.28004 · detector doi_compliance · cross_source · 2026-05-19 18:41:43.163011+00:00

critical doi_compliance unresolvable_identifier

Identifier '10.22405/2226-8383-2021-22-4-263-286' 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

Tropin, A.M.: On the bifurcation of the solution of the Fermat-Steiner problem under 1-parameter variation of the boundary in H(R2). Chebyshevskii sbornik, vol. 22, no. 4, pp. 265–288 (2021). doi:10.22405/2226-8383-2021-22-4-263-286

Evidence payload

{
  "arxiv_id": null,
  "checked_sources": [
    "crossref_by_doi",
    "openalex_by_doi",
    "doi_org_head"
  ],
  "doi": "10.22405/2226-8383-2021-22-4-263-286",
  "raw_excerpt": "Tropin, A.M.: On the bifurcation of the solution of the Fermat-Steiner problem under 1-parameter variation of the boundary in H(R2). Chebyshevskii sbornik, vol. 22, no. 4, pp. 265\u2013288 (2021). doi:10.22405/2226-8383-2021-22-4-263-286",
  "ref_index": 13,
  "verdict_class": "cross_source"
}