Unresolvable Identifier

arXiv:2604.25848 · detector doi_compliance · cross_source · 2026-05-19 20:43:48.077072+00:00

critical doi_compliance unresolvable_identifier

Identifier '10.3390/su1302090213(2021' 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

Y. Cao, S. Wang, J. Li, The optimization model of ride-sharing route for ride hailing considering both system optimization and user fairness, Sustainabilityhttps://doi.org/10.3390/su1302090213(2021) 2728

Evidence payload

{
  "arxiv_id": null,
  "checked_sources": [
    "crossref_by_doi",
    "openalex_by_doi",
    "doi_org_head"
  ],
  "doi": "10.3390/su1302090213(2021",
  "raw_excerpt": "Y. Cao, S. Wang, J. Li, The optimization model of ride-sharing route for ride hailing considering both system optimization and user fairness, Sustainabilityhttps://doi.org/10.3390/su1302090213(2021) 2728",
  "ref_index": 2,
  "verdict_class": "cross_source"
}