{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,4]],"date-time":"2025-10-04T18:20:55Z","timestamp":1759602055440},"reference-count":12,"publisher":"Elsevier BV","issue":"2","license":[{"start":{"date-parts":[[1981,4,1]],"date-time":"1981-04-01T00:00:00Z","timestamp":354931200000},"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":11795,"URL":"https:\/\/www.elsevier.com\/open-access\/userlicense\/1.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Combinatorial Theory, Series B"],"published-print":{"date-parts":[[1981,4]]},"DOI":"10.1016\/0095-8956(81)90059-9","type":"journal-article","created":{"date-parts":[[2004,9,8]],"date-time":"2004-09-08T10:32:55Z","timestamp":1094639575000},"page":"136-143","source":"Crossref","is-referenced-by-count":7,"title":["Xk-Digraphs"],"prefix":"10.1016","volume":"30","author":[{"given":"W.G","family":"Bridges","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R.A","family":"Mena","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"78","reference":[{"key":"10.1016\/0095-8956(81)90059-9_BIB1","doi-asserted-by":"crossref","DOI":"10.1007\/BFb0061260","article-title":"Cyclic Difference Sets","author":"Baumert","year":"1971"},{"key":"10.1016\/0095-8956(81)90059-9_BIB2","doi-asserted-by":"crossref","first-page":"325","DOI":"10.2140\/pjm.1971.38.325","article-title":"The polynomial of a non-regular digraph","volume":"38","author":"Bridges","year":"1971","journal-title":"Pacific J. Math."},{"key":"10.1016\/0095-8956(81)90059-9_BIB3","doi-asserted-by":"crossref","first-page":"174","DOI":"10.1016\/0095-8956(72)90022-6","article-title":"The regularity of x3-graphs","volume":"12","author":"Bridges","year":"1972","journal-title":"J. Combinatorial Theory"},{"key":"10.1016\/0095-8956(81)90059-9_BIB4","doi-asserted-by":"crossref","first-page":"30","DOI":"10.2307\/2312780","article-title":"On the polynomial of a graph","volume":"70","author":"Hoffman","year":"1963","journal-title":"Amer. Math. Monthly"},{"key":"10.1016\/0095-8956(81)90059-9_BIB5","first-page":"303","article-title":"On the polynomial of a directed graph","volume":"10","author":"Hoffman","year":"1965"},{"key":"10.1016\/0095-8956(81)90059-9_BIB6","doi-asserted-by":"crossref","first-page":"51","DOI":"10.1016\/0097-3165(75)90091-6","article-title":"A generalization of cyclic difference sets, I","volume":"19","author":"Lam","year":"1975","journal-title":"J. Combinatorial Theory Ser. A"},{"key":"10.1016\/0095-8956(81)90059-9_BIB7","doi-asserted-by":"crossref","first-page":"177","DOI":"10.1016\/S0097-3165(75)80006-9","article-title":"A generalization of cyclic difference sets, II","volume":"19","author":"Lam","year":"1975","journal-title":"J. Combinatorial Theory Ser. A"},{"key":"10.1016\/0095-8956(81)90059-9_BIB8","doi-asserted-by":"crossref","first-page":"140","DOI":"10.1016\/0097-3165(77)90036-X","article-title":"On some solutions of Ak = dI + \u03bbJ","volume":"23","author":"Lam","year":"1977","journal-title":"J. Combinatorial Theory Ser. A"},{"key":"10.1016\/0095-8956(81)90059-9_BIB9","article-title":"Rational g-Circulants Satisfying the Matrix Equation A2 = dI + \u03bbJ","author":"Lam","year":"1974"},{"key":"10.1016\/0095-8956(81)90059-9_BIB10","doi-asserted-by":"crossref","first-page":"331","DOI":"10.1016\/0095-8956(78)90052-7","article-title":"Directed graphs with unique paths of fixed length","volume":"24","author":"Lam","year":"1978","journal-title":"J. Combinatorial Theory Ser. B"},{"key":"10.1016\/0095-8956(81)90059-9_BIB11","doi-asserted-by":"crossref","first-page":"451","DOI":"10.1016\/0024-3795(70)90036-4","article-title":"A generalization of the matrix equation A2 = J","volume":"3","author":"Ryser","year":"1970","journal-title":"Linear Algebra and Appl."},{"key":"10.1016\/0095-8956(81)90059-9_BIB12","author":"Wielandt","year":"1967"}],"container-title":["Journal of Combinatorial Theory, Series B"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0095895681900599?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0095895681900599?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2019,2,3]],"date-time":"2019-02-03T22:20:26Z","timestamp":1549232426000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/0095895681900599"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1981,4]]},"references-count":12,"journal-issue":{"issue":"2","published-print":{"date-parts":[[1981,4]]}},"alternative-id":["0095895681900599"],"URL":"https:\/\/doi.org\/10.1016\/0095-8956(81)90059-9","relation":{},"ISSN":["0095-8956"],"issn-type":[{"value":"0095-8956","type":"print"}],"subject":[],"published":{"date-parts":[[1981,4]]}}}