doi:10.2307/2004316 (1966 paper) gets matched to https://arxiv.org/pdf/hep-th/0502233v1.pdf (2004 paper) through http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.263.7400 which apparently has a matching DOI: "oa repository (via OAI-PMH doi match)"
{
"updated": "2017-10-20T15:56:27.009012",
"url": "https://arxiv.org/pdf/hep-th/0502233v1.pdf",
"url_for_pdf": "https://arxiv.org/pdf/hep-th/0502233v1.pdf",
"url_for_landing_page": "http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.263.7400",
"evidence": "oa repository (via OAI-PMH doi match)",
"license": null,
"version": "submittedVersion",
"host_type": "repository",
"is_best": true,
"pmh_id": "oai:CiteSeerX.psu:10.1.1.263.7400",
"endpoint_id": "CiteSeerX.psu",
"repository_institution": "CiteSeerX.psu",
"oa_date": null
}https://en.wikipedia.org/w/index.php?title=User_talk:OAbot&diff=prev&oldid=1193800304