{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,8]],"date-time":"2025-12-08T06:46:58Z","timestamp":1765176418314},"reference-count":13,"publisher":"Elsevier BV","issue":"2","license":[{"start":{"date-parts":[[1988,1,1]],"date-time":"1988-01-01T00:00:00Z","timestamp":567993600000},"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":9329,"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]]},"DOI":"10.1016\/0012-365x(88)90090-8","type":"journal-article","created":{"date-parts":[[2002,7,25]],"date-time":"2002-07-25T23:46:59Z","timestamp":1027640819000},"page":"159-168","source":"Crossref","is-referenced-by-count":22,"title":["The spherical genus and virtually planar graphs"],"prefix":"10.1016","volume":"70","author":[{"given":"Seiya","family":"Negami","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"78","reference":[{"key":"10.1016\/0012-365X(88)90090-8_BIB1","doi-asserted-by":"crossref","first-page":"243","DOI":"10.1002\/jgt.3190050305","article-title":"A Kuratowski theorem for the projective plane","volume":"5","author":"Archdeacon","year":"1981","journal-title":"J. Graph Theory"},{"key":"10.1016\/0012-365X(88)90090-8_BIB2","series-title":"Topology of 3-Manifolds and Related Topics","first-page":"110","article-title":"Ends","author":"Epstein","year":"1962"},{"key":"10.1016\/0012-365X(88)90090-8_BIB3","doi-asserted-by":"crossref","first-page":"332","DOI":"10.1016\/0095-8956(79)90022-4","article-title":"103 graphs that are irreducible for the projective plane","volume":"27","author":"Glover","year":"1979","journal-title":"J. Combin. Theory Ser. B"},{"key":"10.1016\/0012-365X(88)90090-8_BIB4","doi-asserted-by":"crossref","first-page":"46","DOI":"10.1002\/sapm193716146","article-title":"The mapping of graphs on surfaces","volume":"16","author":"Kango","year":"1937","journal-title":"J. Math. and Phys."},{"key":"10.1016\/0012-365X(88)90090-8_BIB5","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1002\/jgt.3190080105","article-title":"Automorphism properties of embedded graphs","volume":"8","author":"Hutchinson","year":"1984","journal-title":"J. Graph Theory"},{"key":"10.1016\/0012-365X(88)90090-8_BIB6","doi-asserted-by":"crossref","first-page":"161","DOI":"10.1016\/0012-365X(83)90057-2","article-title":"Uniqueness and faithfulness of embedding of toroidal graphs","volume":"44","author":"Negami","year":"1983","journal-title":"Discrete Math."},{"key":"10.1016\/0012-365X(88)90090-8_BIB7","doi-asserted-by":"crossref","first-page":"189","DOI":"10.1016\/0095-8956(84)90024-8","article-title":"Uniquely and faithfully embeddable projective-planar triangulations","volume":"36","author":"Negami","year":"1984","journal-title":"J. Combin. Theory Ser. B"},{"key":"10.1016\/0012-365X(88)90090-8_BIB8","doi-asserted-by":"crossref","first-page":"235","DOI":"10.1002\/jgt.3190090206","article-title":"Unique and faithful embeddings of projective-planar graphs","volume":"9","author":"Negami","year":"1985","journal-title":"J. Graph Theory"},{"key":"10.1016\/0012-365X(88)90090-8_BIB9","doi-asserted-by":"crossref","first-page":"299","DOI":"10.1016\/0012-365X(86)90217-7","article-title":"Enumeration of projective-planar embeddings of a graph","volume":"62","author":"Negami","year":"1986","journal-title":"Discrete Math."},{"key":"10.1016\/0012-365X(88)90090-8_BIB10","doi-asserted-by":"crossref","first-page":"359","DOI":"10.1002\/jgt.3190110310","article-title":"The virtual k-factorability of graphs","volume":"11","author":"Negami","year":"1987","journal-title":"J. Graph Theory"},{"key":"10.1016\/0012-365X(88)90090-8_BIB11","doi-asserted-by":"crossref","first-page":"127","DOI":"10.2307\/1968718","article-title":"Transformations of finite period","volume":"39","author":"Smith","year":"1938","journal-title":"Ann. Math."},{"key":"10.1016\/0012-365X(88)90090-8_BIB12","series-title":"Algebraic Topology","author":"Spanier","year":"1966"},{"key":"10.1016\/0012-365X(88)90090-8_BIB13","doi-asserted-by":"crossref","first-page":"150","DOI":"10.2307\/2371086","article-title":"Congruent graphs and the connectivity of graphs","volume":"54","author":"Whitney","year":"1932","journal-title":"Amer. J. Math."}],"container-title":["Discrete Mathematics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0012365X88900908?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:0012365X88900908?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2019,4,13]],"date-time":"2019-04-13T00:24:33Z","timestamp":1555115073000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/0012365X88900908"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1988]]},"references-count":13,"journal-issue":{"issue":"2","published-print":{"date-parts":[[1988]]}},"alternative-id":["0012365X88900908"],"URL":"https:\/\/doi.org\/10.1016\/0012-365x(88)90090-8","relation":{},"ISSN":["0012-365X"],"issn-type":[{"value":"0012-365X","type":"print"}],"subject":[],"published":{"date-parts":[[1988]]}}}