@inproceedings{PODS-2006-Cohen,
	author        = "Sara Cohen",
	booktitle     = "{Proceedings of the 25th Symposium on Principles of Database Systems}",
	doi           = "10.1145/1142351.1142362",
	isbn          = "1-59593-318-2",
	pages         = "70--79",
	publisher     = "{ACM}",
	title         = "{Equivalence of queries combining set and bag-set semantics}",
	year          = 2006,
}