@inproceedings{STOC-1997-McCuaigRST,
	author        = "William McCuaig and Neil Robertson and Paul D. Seymour and Robin Thomas",
	booktitle     = "{Proceedings of the 29th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/258533.258625",
	isbn          = "0-89791-888-6",
	pages         = "402--405",
	publisher     = "{ACM}",
	title         = "{Permanents, Pfaffian Orientations, and Even Directed Circuits}",
	year          = 1997,
}