@inproceedings{PODS-2007-GottlobMS,
	author        = "Georg Gottlob and Zoltán Miklós and Thomas Schwentick",
	booktitle     = "{Proceedings of the 26th Symposium on Principles of Database Systems}",
	doi           = "10.1145/1265530.1265533",
	isbn          = "978-1-59593-685-1",
	pages         = "13--22",
	publisher     = "{ACM}",
	title         = "{Generalized hypertree decompositions: np-hardness and tractable variants}",
	year          = 2007,
}