{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,13]],"date-time":"2026-04-13T09:06:33Z","timestamp":1776071193870,"version":"3.50.1"},"reference-count":2,"publisher":"Elsevier BV","issue":"2","license":[{"start":{"date-parts":[[1976,4,1]],"date-time":"1976-04-01T00:00:00Z","timestamp":197164800000},"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":13621,"URL":"https:\/\/www.elsevier.com\/open-access\/userlicense\/1.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Computer and System Sciences"],"published-print":{"date-parts":[[1976,4]]},"DOI":"10.1016\/s0022-0000(76)80034-7","type":"journal-article","created":{"date-parts":[[2010,11,10]],"date-time":"2010-11-10T09:46:40Z","timestamp":1289382400000},"page":"134-146","source":"Crossref","is-referenced-by-count":79,"title":["Complexity measures for regular expressions"],"prefix":"10.1016","volume":"12","author":[{"given":"Andrzej","family":"Ehrenfeucht","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paul","family":"Zeiger","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"78","reference":[{"key":"10.1016\/S0022-0000(76)80034-7_bib1","doi-asserted-by":"crossref","first-page":"281","DOI":"10.1016\/S0022-0000(70)80025-3","article-title":"Star height of certain families of regular events","volume":"4","author":"Cohen","year":"1970","journal-title":"J. Comput. System Sci."},{"key":"10.1016\/S0022-0000(76)80034-7_bib2","first-page":"39","author":"Hopcroft","year":"1969"}],"container-title":["Journal of Computer and System Sciences"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0022000076800347?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0022000076800347?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2018,12,6]],"date-time":"2018-12-06T23:54:34Z","timestamp":1544140474000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S0022000076800347"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1976,4]]},"references-count":2,"journal-issue":{"issue":"2","published-print":{"date-parts":[[1976,4]]}},"alternative-id":["S0022000076800347"],"URL":"https:\/\/doi.org\/10.1016\/s0022-0000(76)80034-7","relation":{},"ISSN":["0022-0000"],"issn-type":[{"value":"0022-0000","type":"print"}],"subject":[],"published":{"date-parts":[[1976,4]]}}}