Unresolvable Identifier

arXiv:2604.23155 · detector doi_compliance · cross_source · 2026-05-19 23:24:36.471772+00:00

critical doi_compliance unresolvable_identifier

Identifier '10.1016/0898-1221(90)90109-6' 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

E.J. Kansa, Multiquadrics—a scattered data approximation scheme with applications to computational fluid-dynamics—I. Surface approximations and partial derivative estimates, Computers & Mathemat- ics with Applications 19 (8–9) (1990) 127–145. DOI: 10.1016/0898-1221(90)90109-6

Evidence payload

{
  "arxiv_id": null,
  "checked_sources": [
    "crossref_by_doi",
    "openalex_by_doi",
    "doi_org_head"
  ],
  "doi": "10.1016/0898-1221(90)90109-6",
  "raw_excerpt": "E.J. Kansa, Multiquadrics\u2014a scattered data approximation scheme with applications to computational fluid-dynamics\u2014I. Surface approximations and partial derivative estimates, Computers & Mathemat- ics with Applications 19 (8\u20139) (1990) 127\u2013145. DOI: 10.1016/0898-1221(90)90109-6",
  "ref_index": 31,
  "verdict_class": "cross_source"
}