Unresolvable Identifier

arXiv:2604.21747 · detector doi_compliance · cross_source · 2026-05-20 00:42:24.175170+00:00

critical doi_compliance unresolvable_identifier

Identifier '10.3390/bios14100481/s1' 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

T. Nguyen et al., “A Wireless and Wearable Multimodal Sensor to Non-Invasively Monitor Transabdominal Placental Oxygen Saturation and Maternal Physiological Signals,” Biosen- sors (Basel). 14(10), 481 (2024) [doi:10.3390/BIOS14100481/S1]

Evidence payload

{
  "arxiv_id": null,
  "checked_sources": [
    "crossref_by_doi",
    "openalex_by_doi",
    "doi_org_head"
  ],
  "doi": "10.3390/bios14100481/s1",
  "raw_excerpt": "T. Nguyen et al., \u201cA Wireless and Wearable Multimodal Sensor to Non-Invasively Monitor Transabdominal Placental Oxygen Saturation and Maternal Physiological Signals,\u201d Biosen- sors (Basel). 14(10), 481 (2024) [doi:10.3390/BIOS14100481/S1]",
  "ref_index": 16,
  "verdict_class": "cross_source"
}