{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,13]],"date-time":"2026-01-13T01:39:56Z","timestamp":1768268396538,"version":"3.49.0"},"reference-count":6,"publisher":"Elsevier BV","issue":"4","license":[{"start":{"date-parts":[[1976,1,1]],"date-time":"1976-01-01T00:00:00Z","timestamp":189302400000},"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":13712,"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":[[1976]]},"DOI":"10.1016\/0012-365x(76)90044-3","type":"journal-article","created":{"date-parts":[[2002,7,25]],"date-time":"2002-07-25T23:33:13Z","timestamp":1027639993000},"page":"307-310","source":"Crossref","is-referenced-by-count":3,"title":["On metrizability of the free monoids"],"prefix":"10.1016","volume":"15","author":[{"given":"Cristian","family":"Calude","sequence":"first","affiliation":[]}],"member":"78","reference":[{"key":"10.1016\/0012-365X(76)90044-3_BIB1","first-page":"69","article-title":"On a principle of metrization","volume":"1","author":"Barbilian","year":"1959","journal-title":"Stud. Cerc. Mat."},{"key":"10.1016\/0012-365X(76)90044-3_BIB2","first-page":"133","article-title":"Sur une classe distances dans un demigroupe libre","volume":"17","author":"Calude","year":"1973","journal-title":"Bull. Math. Soc. Sci. Math. R.S. Roumanie"},{"key":"10.1016\/0012-365X(76)90044-3_BIB3","article-title":"On contextual distances in mathematical linguistics","volume":"3","author":"Calude","year":"1976","journal-title":"Stud. Cerc. Mat."},{"key":"10.1016\/0012-365X(76)90044-3_BIB4","first-page":"223","article-title":"Contextual distances in algebraic linguistics","volume":"2","author":"Dinca","year":"1973","journal-title":"Stud. Cerc. Mat."},{"key":"10.1016\/0012-365X(76)90044-3_BIB5","volume":"Vol. I, II","author":"Kuratowski","year":"1958"},{"key":"10.1016\/0012-365X(76)90044-3_BIB6","series-title":"Introduction math\u00e9matique ala linguistique structurale","author":"Marcus","year":"1966"}],"container-title":["Discrete Mathematics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0012365X76900443?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0012365X76900443?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2019,4,13]],"date-time":"2019-04-13T06:56:11Z","timestamp":1555138571000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/0012365X76900443"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1976]]},"references-count":6,"journal-issue":{"issue":"4","published-print":{"date-parts":[[1976]]}},"alternative-id":["0012365X76900443"],"URL":"https:\/\/doi.org\/10.1016\/0012-365x(76)90044-3","relation":{},"ISSN":["0012-365X"],"issn-type":[{"value":"0012-365X","type":"print"}],"subject":[],"published":{"date-parts":[[1976]]}}}