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The cited work could not be located through any authoritative source.","detected_doi":"10.21437/interspeech.2022-2451","detected_arxiv_id":null,"ref_index":53,"audited_at":"2026-05-19T20:55:25.588824Z"},{"detector":"doi_compliance","finding_type":"unresolvable_identifier","severity":"critical","verdict_class":"cross_source","note":"Identifier '10.21437/interspeech.2019-1642' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. 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