{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2022,4,1]],"date-time":"2022-04-01T09:44:52Z","timestamp":1648806292367},"reference-count":7,"publisher":"Elsevier BV","issue":"2","license":[{"start":{"date-parts":[[1991,7,1]],"date-time":"1991-07-01T00:00:00Z","timestamp":678326400000},"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":8052,"URL":"https:\/\/www.elsevier.com\/open-access\/userlicense\/1.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Discrete Applied Mathematics"],"published-print":{"date-parts":[[1991,7]]},"DOI":"10.1016\/0166-218x(91)90099-i","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T03:43:01Z","timestamp":1027654981000},"page":"183-193","source":"Crossref","is-referenced-by-count":0,"title":["Power languages and density"],"prefix":"10.1016","volume":"32","author":[{"given":"Valtteri","family":"Niemi","sequence":"first","affiliation":[]}],"member":"78","reference":[{"key":"10.1016\/0166-218X(91)90099-I_BIB1","first-page":"167","article-title":"Denseness, maximality and decidability of grammatical families","volume":"11","author":"Maurer","year":"1986"},{"key":"10.1016\/0166-218X(91)90099-I_BIB2","doi-asserted-by":"crossref","first-page":"118","DOI":"10.1145\/322290.322298","article-title":"Dense hierarchies of grammatical families","volume":"29","author":"Maurer","year":"1982","journal-title":"J. ACM"},{"key":"10.1016\/0166-218X(91)90099-I_BIB3_1","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1080\/00207168608803528","article-title":"Density of grammar forms (Part I and II)","volume":"20","author":"Niemi","year":"1986","journal-title":"Internat. J. Comput. Math."},{"key":"10.1016\/0166-218X(91)90099-I_BIB3_2","doi-asserted-by":"crossref","first-page":"91","DOI":"10.1080\/00207168608803535","article-title":"Density of grammar forms (Part II)","volume":"20","author":"Niemi","year":"1986","journal-title":"Internat. J. Comput. Math."},{"key":"10.1016\/0166-218X(91)90099-I_BIB4","series-title":"Proceedings ICALP '88","first-page":"424","article-title":"Maximal dense intervals of grammar forms","volume":"317","author":"Niemi","year":"1988"},{"key":"10.1016\/0166-218X(91)90099-I_BIB5","doi-asserted-by":"crossref","first-page":"29","DOI":"10.1016\/0304-3975(82)90129-3","article-title":"Color-families are dense","volume":"17","author":"Welzl","year":"1982","journal-title":"Theoret. Comput. Sci."},{"key":"10.1016\/0166-218X(91)90099-I_BIB6","article-title":"Grammar and L Forms: An Introduction","volume":"91","author":"Wood","year":"1980"}],"container-title":["Discrete Applied Mathematics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0166218X9190099I?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0166218X9190099I?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2019,4,13]],"date-time":"2019-04-13T06:20:25Z","timestamp":1555136425000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/0166218X9190099I"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1991,7]]},"references-count":7,"journal-issue":{"issue":"2","published-print":{"date-parts":[[1991,7]]}},"alternative-id":["0166218X9190099I"],"URL":"https:\/\/doi.org\/10.1016\/0166-218x(91)90099-i","relation":{},"ISSN":["0166-218X"],"issn-type":[{"value":"0166-218X","type":"print"}],"subject":[],"published":{"date-parts":[[1991,7]]}}}