@inproceedings{STOC-1980-Lichtenstein,
	author        = "David Lichtenstein",
	booktitle     = "{Proceedings of the 12th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/800141.804669",
	pages         = "218--224",
	publisher     = "{ACM}",
	title         = "{Isomorphism for Graphs Embeddable on the Projective Plane}",
	year          = 1980,
}