{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2022,4,4]],"date-time":"2022-04-04T08:12:46Z","timestamp":1649059966034},"reference-count":3,"publisher":"Elsevier BV","issue":"2","license":[{"start":{"date-parts":[[1973,3,1]],"date-time":"1973-03-01T00:00:00Z","timestamp":99792000000},"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":14748,"URL":"https:\/\/www.elsevier.com\/open-access\/userlicense\/1.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Combinatorial Theory, Series A"],"published-print":{"date-parts":[[1973,3]]},"DOI":"10.1016\/0097-3165(73)90026-5","type":"journal-article","created":{"date-parts":[[2005,2,10]],"date-time":"2005-02-10T04:49:18Z","timestamp":1108010958000},"page":"253-255","source":"Crossref","is-referenced-by-count":1,"title":["Some combinatorial properties of summation operators"],"prefix":"10.1016","volume":"14","author":[{"family":"Nguyen-Huu-Bong","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"78","reference":[{"key":"10.1016\/0097-3165(73)90026-5_BIB1","doi-asserted-by":"crossref","first-page":"213","DOI":"10.1016\/0097-3165(71)90049-5","article-title":"Some combinatorial properties of summation operators","volume":"A11","author":"Bong","year":"1971","journal-title":"J. Combinatorial Theory"},{"key":"10.1016\/0097-3165(73)90026-5_BIB2","series-title":"The Calculus of Finite Differences","author":"Jordan","year":"1960"},{"key":"10.1016\/0097-3165(73)90026-5_BIB3","series-title":"Combinatorial Identities","author":"Riordan","year":"1968"}],"container-title":["Journal of Combinatorial Theory, Series A"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0097316573900265?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0097316573900265?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2019,1,29]],"date-time":"2019-01-29T09:23:41Z","timestamp":1548753821000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/0097316573900265"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1973,3]]},"references-count":3,"journal-issue":{"issue":"2","published-print":{"date-parts":[[1973,3]]}},"alternative-id":["0097316573900265"],"URL":"https:\/\/doi.org\/10.1016\/0097-3165(73)90026-5","relation":{},"ISSN":["0097-3165"],"issn-type":[{"value":"0097-3165","type":"print"}],"subject":[],"published":{"date-parts":[[1973,3]]}}}