@inproceedings{STOC-1993-FederV,
	author        = "Tomás Feder and Moshe Y. Vardi",
	booktitle     = "{Proceedings of the 25th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/167088.167245",
	isbn          = "0-89791-591-7",
	pages         = "612--622",
	publisher     = "{ACM}",
	title         = "{Monotone monadic SNP and constraint satisfaction}",
	year          = 1993,
}