{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,8]],"date-time":"2026-05-08T12:42:14Z","timestamp":1778244134779,"version":"3.51.4"},"reference-count":10,"publisher":"Elsevier BV","issue":"2","license":[{"start":{"date-parts":[[1990,12,1]],"date-time":"1990-12-01T00:00:00Z","timestamp":660009600000},"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":8264,"URL":"https:\/\/www.elsevier.com\/open-access\/userlicense\/1.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Combinatorial Theory, Series B"],"published-print":{"date-parts":[[1990,12]]},"DOI":"10.1016\/0095-8956(90)90075-b","type":"journal-article","created":{"date-parts":[[2005,2,9]],"date-time":"2005-02-09T14:37:08Z","timestamp":1107959828000},"page":"208-213","source":"Crossref","is-referenced-by-count":5,"title":["On adjoints and dual matroids"],"prefix":"10.1016","volume":"50","author":[{"given":"M","family":"Alfter","sequence":"first","affiliation":[]},{"given":"W","family":"Kern","sequence":"additional","affiliation":[]},{"given":"A","family":"Wanka","sequence":"additional","affiliation":[]}],"member":"78","reference":[{"key":"10.1016\/0095-8956(90)90075-B_BIB1","doi-asserted-by":"crossref","first-page":"299","DOI":"10.1007\/BF02579255","article-title":"Adjoints of oriented matroids","volume":"6","author":"Bachem","year":"1986","journal-title":"Combinatorica"},{"key":"10.1016\/0095-8956(90)90075-B_BIB2","doi-asserted-by":"crossref","first-page":"193","DOI":"10.1016\/S0195-6698(86)80020-8","article-title":"Extension equivalence of oriented matroids","volume":"7","author":"Bachem","year":"1986","journal-title":"European J. Combin."},{"key":"10.1016\/0095-8956(90)90075-B_BIB3","doi-asserted-by":"crossref","unstructured":"A. Bachem and A. Wanka, Matroids without adjoints, Geom. Dedicata, to appear.","DOI":"10.1007\/BF00572447"},{"key":"10.1016\/0095-8956(90)90075-B_BIB4","doi-asserted-by":"crossref","first-page":"363","DOI":"10.4153\/CMB-1974-066-5","article-title":"Adjoints of a geometry","volume":"17","author":"Cheung","year":"1974","journal-title":"Canadian Math. Bull."},{"key":"10.1016\/0095-8956(90)90075-B_BIB5","first-page":"219","article-title":"Oriented matroids of rank three and arrangements of pseudolines","volume":"17","author":"Cordovil","year":"1983","journal-title":"Ann. Discrete Math."},{"key":"10.1016\/0095-8956(90)90075-B_BIB6","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1016\/0024-3795(87)90301-6","article-title":"Polarity and point extensions in oriented matroids","volume":"90","author":"Cordovil","year":"1987","journal-title":"Linear Algebra Appl."},{"key":"10.1016\/0095-8956(90)90075-B_BIB7","author":"Crapo","year":"1970"},{"key":"10.1016\/0095-8956(90)90075-B_BIB8","series-title":"Algebraic Methods in Graph Theory","article-title":"Glueing matroids together: A study of Dilworth truncations and matroids analogues of exterior and symmetric powers","author":"Mason","year":"1981"},{"key":"10.1016\/0095-8956(90)90075-B_BIB9","series-title":"Probl\u00e8mes Combinatoires et Th\u00e9orie des Graphes","first-page":"263","article-title":"Extensions punctuelles d'une g\u00e9om\u00e9trie orient\u00e9","author":"Las Vergnas","year":"1978"},{"key":"10.1016\/0095-8956(90)90075-B_BIB10","author":"Welsh","year":"1976"}],"container-title":["Journal of Combinatorial Theory, Series B"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:009589569090075B?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:009589569090075B?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2019,1,29]],"date-time":"2019-01-29T15:52:05Z","timestamp":1548777125000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/009589569090075B"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1990,12]]},"references-count":10,"journal-issue":{"issue":"2","published-print":{"date-parts":[[1990,12]]}},"alternative-id":["009589569090075B"],"URL":"https:\/\/doi.org\/10.1016\/0095-8956(90)90075-b","relation":{},"ISSN":["0095-8956"],"issn-type":[{"value":"0095-8956","type":"print"}],"subject":[],"published":{"date-parts":[[1990,12]]}}}