@inproceedings{PODS-2005-LeindersB,
	author        = "Dirk Leinders and Jan Van den Bussche",
	booktitle     = "{Proceedings of the 24th Symposium on Principles of Database Systems}",
	doi           = "10.1145/1065167.1065178",
	isbn          = "1-59593-062-0",
	pages         = "76--83",
	publisher     = "{ACM}",
	title         = "{On the complexity of division and set joins in the relational algebra}",
	year          = 2005,
}