{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,8]],"date-time":"2026-04-08T04:58:20Z","timestamp":1775624300523,"version":"3.50.1"},"reference-count":4,"publisher":"Elsevier BV","issue":"2","license":[{"start":{"date-parts":[[1988,4,1]],"date-time":"1988-04-01T00:00:00Z","timestamp":575856000000},"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":9238,"URL":"https:\/\/www.elsevier.com\/open-access\/userlicense\/1.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Discrete Mathematics"],"published-print":{"date-parts":[[1988,4]]},"DOI":"10.1016\/0012-365x(88)90017-9","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T03:43:43Z","timestamp":1027655023000},"page":"189-194","source":"Crossref","is-referenced-by-count":6,"title":["On \u03c3-polynomials"],"prefix":"10.1016","volume":"69","author":[{"given":"Shao-Ji","family":"Xu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"78","reference":[{"key":"10.1016\/0012-365X(88)90017-9_BIB1","doi-asserted-by":"crossref","first-page":"137","DOI":"10.1016\/0095-8956(78)90015-1","article-title":"\u03c3-polynomials and graph coloring","volume":"24","author":"Korfhage","year":"1978","journal-title":"J. Combin. Theory Ser. B"},{"key":"10.1016\/0012-365X(88)90017-9_BIB2","first-page":"161","article-title":"Some chromatically unique graphs with seven points","volume":"16-A","author":"Frucht","year":"1983","journal-title":"Ars Combin."},{"key":"10.1016\/0012-365X(88)90017-9_BIB3","doi-asserted-by":"crossref","first-page":"52","DOI":"10.1016\/S0021-9800(68)80087-0","article-title":"An introduction to chromatic polynomials","volume":"4","author":"Read","year":"1968","journal-title":"J. Combin. Theory"},{"key":"10.1016\/0012-365X(88)90017-9_BIB4","doi-asserted-by":"crossref","first-page":"210","DOI":"10.1016\/0095-8956(84)90053-4","article-title":"Characterization of quadratic and cubic \u03c3-polynomials","volume":"37","author":"Dhurandhar","year":"1984","journal-title":"J. Combin. Theory Ser. B"}],"container-title":["Discrete Mathematics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0012365X88900179?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0012365X88900179?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2019,4,13]],"date-time":"2019-04-13T05:26:46Z","timestamp":1555133206000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/0012365X88900179"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1988,4]]},"references-count":4,"journal-issue":{"issue":"2","published-print":{"date-parts":[[1988,4]]}},"alternative-id":["0012365X88900179"],"URL":"https:\/\/doi.org\/10.1016\/0012-365x(88)90017-9","relation":{},"ISSN":["0012-365X"],"issn-type":[{"value":"0012-365X","type":"print"}],"subject":[],"published":{"date-parts":[[1988,4]]}}}