{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,5]],"date-time":"2025-10-05T04:18:49Z","timestamp":1759637929849},"reference-count":11,"publisher":"Elsevier BV","issue":"1","license":[{"start":{"date-parts":[[1971,2,1]],"date-time":"1971-02-01T00:00:00Z","timestamp":34214400000},"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":15507,"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":[[1971,2]]},"DOI":"10.1016\/s0022-0000(71)80007-7","type":"journal-article","created":{"date-parts":[[2010,11,10]],"date-time":"2010-11-10T04:46:40Z","timestamp":1289364400000},"page":"54-66","source":"Crossref","is-referenced-by-count":11,"title":["The use of lists in the study of undecidable problemsin automata theory"],"prefix":"10.1016","volume":"5","author":[{"given":"J.","family":"Hartmanis","sequence":"first","affiliation":[]},{"given":"F.D.","family":"Lewis","sequence":"additional","affiliation":[]}],"member":"78","reference":[{"key":"10.1016\/S0022-0000(71)80007-7_bib1","series-title":"2nd Ann. ACM. Symp. on Theory of Comput.","first-page":"10","article-title":"The degree hierarchy of undecidable problems of formal grammars","author":"Cudia","year":"1970"},{"key":"10.1016\/S0022-0000(71)80007-7_bib2","author":"Davis","year":"1958"},{"key":"10.1016\/S0022-0000(71)80007-7_bib3","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1090\/psapm\/019\/0235938","article-title":"Context free languages and Turing machine computations","volume":"19","author":"Hartmanis","year":"1967","journal-title":"Proc. Symp. Appl. Math."},{"key":"10.1016\/S0022-0000(71)80007-7_bib4","doi-asserted-by":"crossref","first-page":"41","DOI":"10.1090\/S0002-9947-1943-0007371-8","article-title":"Recursive predicates and quantifiers","volume":"53","author":"Kleene","year":"1943","journal-title":"Trans. Amer. Math. Soc."},{"key":"10.1016\/S0022-0000(71)80007-7_bib5","author":"Kleene","year":"1952"},{"key":"10.1016\/S0022-0000(71)80007-7_bib6","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1007\/BF01977642","article-title":"Number theoretic concepts and recursive well-orderings","volume":"5","author":"Kreisel","year":"1960","journal-title":"Arch. Math. Logik Grundlagenforsh"},{"key":"10.1016\/S0022-0000(71)80007-7_bib7","doi-asserted-by":"crossref","first-page":"97","DOI":"10.1002\/malq.19550010205","article-title":"Creative sets","volume":"1","author":"Myhill","year":"1955","journal-title":"Z. Math. Logik Grundlagen Math."},{"key":"10.1016\/S0022-0000(71)80007-7_bib8","doi-asserted-by":"crossref","first-page":"284","DOI":"10.1090\/S0002-9904-1944-08111-1","article-title":"Recursively enumerable sets of positive integers and their decision problems","volume":"50","author":"Post","year":"1944","journal-title":"Bull. Amer. Math. Soc."},{"key":"10.1016\/S0022-0000(71)80007-7_bib9","doi-asserted-by":"crossref","first-page":"125","DOI":"10.1007\/BF01342939","article-title":"Computing degrees of unsolvability","volume":"138","author":"Rogers","year":"1959","journal-title":"Math. Ann."},{"key":"10.1016\/S0022-0000(71)80007-7_bib10","doi-asserted-by":"crossref","first-page":"331","DOI":"10.2307\/2964292","article-title":"G\u00f6del numbering of partial recursive functions","volume":"23","author":"Rogers","year":"1958","journal-title":"J. Symbolic Logic"},{"key":"10.1016\/S0022-0000(71)80007-7_bib11","author":"Rogers","year":"1967"}],"container-title":["Journal of Computer and System Sciences"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0022000071800077?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S0022000071800077?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2018,12,6]],"date-time":"2018-12-06T18:53:04Z","timestamp":1544122384000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S0022000071800077"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1971,2]]},"references-count":11,"journal-issue":{"issue":"1","published-print":{"date-parts":[[1971,2]]}},"alternative-id":["S0022000071800077"],"URL":"https:\/\/doi.org\/10.1016\/s0022-0000(71)80007-7","relation":{},"ISSN":["0022-0000"],"issn-type":[{"value":"0022-0000","type":"print"}],"subject":[],"published":{"date-parts":[[1971,2]]}}}