{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2022,4,3]],"date-time":"2022-04-03T21:15:30Z","timestamp":1649020530633},"reference-count":2,"publisher":"Elsevier BV","issue":"4","license":[{"start":{"date-parts":[[1987,6,1]],"date-time":"1987-06-01T00:00:00Z","timestamp":549504000000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Information Processing Letters"],"published-print":{"date-parts":[[1987,6]]},"DOI":"10.1016\/0020-0190(87)90166-9","type":"journal-article","created":{"date-parts":[[2003,3,14]],"date-time":"2003-03-14T14:37:33Z","timestamp":1047652653000},"page":"233-234","source":"Crossref","is-referenced-by-count":5,"title":["A deficiency of natural deduction"],"prefix":"10.1016","volume":"25","author":[{"given":"J.G.","family":"Wiltink","sequence":"first","affiliation":[]}],"member":"78","reference":[{"key":"10.1016\/0020-0190(87)90166-9_BIB1","series-title":"Program Construction and Verification, International Series in Computer Science","author":"Backhouse","year":"1986"},{"key":"10.1016\/0020-0190(87)90166-9_BIB2","doi-asserted-by":"crossref","first-page":"176","DOI":"10.1007\/BF01201353","article-title":"Untersuchungen \u00fcber das logische Schliessen","volume":"39","author":"Gentzen","year":"1935","journal-title":"Math. Zeit."}],"container-title":["Information Processing Letters"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0020019087901669?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0020019087901669?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2019,3,26]],"date-time":"2019-03-26T05:54:25Z","timestamp":1553579665000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/0020019087901669"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1987,6]]},"references-count":2,"journal-issue":{"issue":"4","published-print":{"date-parts":[[1987,6]]}},"alternative-id":["0020019087901669"],"URL":"https:\/\/doi.org\/10.1016\/0020-0190(87)90166-9","relation":{},"ISSN":["0020-0190"],"issn-type":[{"value":"0020-0190","type":"print"}],"subject":[],"published":{"date-parts":[[1987,6]]}}}