{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,30]],"date-time":"2026-06-30T13:48:29Z","timestamp":1782827309831,"version":"3.54.5"},"reference-count":2,"publisher":"Elsevier BV","issue":"1","license":[{"start":{"date-parts":[[1985,9,1]],"date-time":"1985-09-01T00:00:00Z","timestamp":494380800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"},{"start":{"date-parts":[[1985,9,1]],"date-time":"1985-09-01T00:00:00Z","timestamp":494380800000},"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":10181,"URL":"http:\/\/www.elsevier.com\/open-access\/userlicense\/1.0\/"}],"funder":[{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["DMS-8406100"],"award-info":[{"award-number":["DMS-8406100"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["elsevier.com","sciencedirect.com"],"crossmark-restriction":true},"short-container-title":["Discrete Mathematics"],"published-print":{"date-parts":[[1985,9]]},"DOI":"10.1016\/0012-365x(85)90193-1","type":"journal-article","created":{"date-parts":[[2003,3,25]],"date-time":"2003-03-25T09:55:35Z","timestamp":1048586135000},"page":"73-74","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":12,"title":["On \u0201k-sets\u0201 in the plane"],"prefix":"10.1016","volume":"56","author":[{"given":"G.W.","family":"Peck","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"78","reference":[{"key":"10.1016\/0012-365X(85)90193-1_bib1","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1016\/0097-3165(84)90081-5","article-title":"On the number of k-subsets of a set of n points in the plane","volume":"36","author":"Goodman","year":"1984","journal-title":"J. Combin. Theory Ser. A"},{"key":"10.1016\/0012-365X(85)90193-1_bib2","unstructured":"N. Alon and E. Gyori, The number of small semispaces of a finite set of points in the plane, J. Combin. Theory Ser. A (to appear)."}],"container-title":["Discrete Mathematics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0012365X85901931?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0012365X85901931?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2026,6,30]],"date-time":"2026-06-30T13:25:55Z","timestamp":1782825955000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/0012365X85901931"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1985,9]]},"references-count":2,"journal-issue":{"issue":"1","published-print":{"date-parts":[[1985,9]]}},"alternative-id":["0012365X85901931"],"URL":"https:\/\/doi.org\/10.1016\/0012-365x(85)90193-1","relation":{},"ISSN":["0012-365X"],"issn-type":[{"value":"0012-365X","type":"print"}],"subject":[],"published":{"date-parts":[[1985,9]]},"assertion":[{"value":"Elsevier","name":"publisher","label":"This article is maintained by"},{"value":"On \u0201k-sets\u0201 in the plane","name":"articletitle","label":"Article Title"},{"value":"Discrete Mathematics","name":"journaltitle","label":"Journal Title"},{"value":"https:\/\/doi.org\/10.1016\/0012-365X(85)90193-1","name":"articlelink","label":"CrossRef DOI link to publisher maintained version"},{"value":"article","name":"content_type","label":"Content Type"},{"value":"Copyright \u00a9 1985 Published by Elsevier B.V.","name":"copyright","label":"Copyright"}]}}