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Xuong, Nguyen Huy (1979), "How to determine the maximum genus of a graph", Journal of Combinatorial Theory, Series B, 26 (2): 217–225, doi:10.1016/0095-8956(79)90058-3, MR 0532589 /wiki/Doi_(identifier)
Beineke, Lowell W.; Wilson, Robin J. (2009), Topics in topological graph theory, Encyclopedia of Mathematics and its Applications, vol. 128, Cambridge University Press, Cambridge, p. 36, doi:10.1017/CBO9781139087223, ISBN 978-0-521-80230-7, MR 2581536 978-0-521-80230-7
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