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Reconstructed DOI 10.1103/PhysRevA.79.053824 resolves to 'Laser with an in-loop relative frequency stability of<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"i'. A reader following the printed text alone cannot reach it.","detected_doi":"10.1103/PhysRevA.79.053824","detected_arxiv_id":null,"ref_index":35,"audited_at":"2026-07-30T18:41:40.155968Z"},{"detector":"doi_compliance","finding_type":"unresolvable_identifier","severity":"critical","verdict_class":"cross_source","note":"Identifier '10.1063/1.4961665/15760069/094502_1_online.pdf' is syntactically valid but the DOI registry (doi.org) returned 404, and Crossref / OpenAlex / internal corpus also have no record. 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Reconstructed DOI 10.1103/PhysRevA.79.053824 resolves to 'Laser with an in-loop relative frequency stability of<mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" display=\"i'. A reader following the printed text alone cannot reach it.","snippet":"F. Acernese et al. Laser with an in-loop relative frequency stability of1.0×10−21 on a 100-ms time scale for gravitational-wave detection.Physical Review A, 79:053824, May 2009. 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