{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,20]],"date-time":"2026-06-20T04:42:13Z","timestamp":1781930533150,"version":"3.54.5"},"reference-count":3,"publisher":"Elsevier BV","issue":"1-3","license":[{"start":{"date-parts":[[1989,5,1]],"date-time":"1989-05-01T00:00:00Z","timestamp":609984000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"},{"start":{"date-parts":[[2013,7,17]],"date-time":"2013-07-17T00:00:00Z","timestamp":1374019200000},"content-version":"vor","delay-in-days":8843,"URL":"https:\/\/www.elsevier.com\/open-access\/userlicense\/1.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Discrete Mathematics"],"published-print":{"date-parts":[[1989,5]]},"DOI":"10.1016\/0012-365x(89)90080-0","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T03:43:43Z","timestamp":1027655023000},"page":"81-88","source":"Crossref","is-referenced-by-count":35,"title":["On clustering problems with connected optima in euclidean spaces"],"prefix":"10.1016","volume":"75","author":[{"given":"Endre","family":"Boros","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter L.","family":"Hammer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"78","reference":[{"key":"10.1016\/0012-365X(89)90080-0_BIB1","author":"Hoffman","year":"1985","journal-title":"Communication of the XII. International Symposium on Mathematical Programming"},{"key":"10.1016\/0012-365X(89)90080-0_BIB2","series-title":"Clustering is optimal or optimal partitions having disjoint conic or convex hulls, colloquium talk","author":"Rothblum","year":"1988"},{"key":"10.1016\/0012-365X(89)90080-0_BIB3","article-title":"The separation problem: Linearization and the equivalence of all degree 2 binary optimization problems","author":"Williams","year":"1988","journal-title":"RUTCOR Research Report, RRR #21-88"}],"container-title":["Discrete Mathematics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0012365X89900800?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0012365X89900800?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2019,4,13]],"date-time":"2019-04-13T05:50:50Z","timestamp":1555134650000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/0012365X89900800"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1989,5]]},"references-count":3,"journal-issue":{"issue":"1-3","published-print":{"date-parts":[[1989,5]]}},"alternative-id":["0012365X89900800"],"URL":"https:\/\/doi.org\/10.1016\/0012-365x(89)90080-0","relation":{},"ISSN":["0012-365X"],"issn-type":[{"value":"0012-365X","type":"print"}],"subject":[],"published":{"date-parts":[[1989,5]]}}}