{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T00:56:18Z","timestamp":1767833778783,"version":"3.49.0"},"reference-count":2,"publisher":"Elsevier BV","issue":"1-3","license":[{"start":{"date-parts":[[1999,4,1]],"date-time":"1999-04-01T00:00:00Z","timestamp":922924800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"},{"start":{"date-parts":[[1999,4,1]],"date-time":"1999-04-01T00:00:00Z","timestamp":922924800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/legal\/tdmrep-license"},{"start":{"date-parts":[[2013,7,17]],"date-time":"2013-07-17T00:00:00Z","timestamp":1374019200000},"content-version":"vor","delay-in-days":5221,"URL":"http:\/\/www.elsevier.com\/open-access\/userlicense\/1.0\/"}],"content-domain":{"domain":["elsevier.com","sciencedirect.com"],"crossmark-restriction":true},"short-container-title":["Discrete Mathematics"],"published-print":{"date-parts":[[1999,4]]},"DOI":"10.1016\/s0012-365x(98)00310-0","type":"journal-article","created":{"date-parts":[[2003,5,19]],"date-time":"2003-05-19T12:52:26Z","timestamp":1053348746000},"page":"21-23","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":57,"title":["A short proof that \u2018proper = unit\u2019"],"prefix":"10.1016","volume":"201","author":[{"given":"Kenneth P.","family":"Bogart","sequence":"first","affiliation":[]},{"given":"Douglas B.","family":"West","sequence":"additional","affiliation":[]}],"member":"78","reference":[{"key":"10.1016\/S0012-365X(98)00310-0_BIB1","series-title":"Proof Techniques in Graph Theory","first-page":"139","article-title":"Indifference graphs","author":"Roberts","year":"1969"},{"key":"10.1016\/S0012-365X(98)00310-0_BIB2","doi-asserted-by":"crossref","first-page":"233","DOI":"10.2307\/2964389","article-title":"Foundational aspects of theories of measurement","volume":"23","author":"Scott","year":"1958","journal-title":"J. Symbol. Logic"}],"container-title":["Discrete Mathematics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0012365X98003100?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0012365X98003100?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2025,11,2]],"date-time":"2025-11-02T22:46:39Z","timestamp":1762123599000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S0012365X98003100"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1999,4]]},"references-count":2,"journal-issue":{"issue":"1-3","published-print":{"date-parts":[[1999,4]]}},"alternative-id":["S0012365X98003100"],"URL":"https:\/\/doi.org\/10.1016\/s0012-365x(98)00310-0","relation":{},"ISSN":["0012-365X"],"issn-type":[{"value":"0012-365X","type":"print"}],"subject":[],"published":{"date-parts":[[1999,4]]},"assertion":[{"value":"Elsevier","name":"publisher","label":"This article is maintained by"},{"value":"A short proof that \u2018proper = unit\u2019","name":"articletitle","label":"Article Title"},{"value":"Discrete Mathematics","name":"journaltitle","label":"Journal Title"},{"value":"https:\/\/doi.org\/10.1016\/S0012-365X(98)00310-0","name":"articlelink","label":"CrossRef DOI link to publisher maintained version"},{"value":"converted-article","name":"content_type","label":"Content Type"},{"value":"Copyright \u00a9 1999 Published by Elsevier B.V.","name":"copyright","label":"Copyright"}]}}