@inproceedings{SIGMOD-2009-KoutrikaBG,
	author        = "Georgia Koutrika and Benjamin Bercovitz and Hector Garcia-Molina",
	booktitle     = "{Proceedings of the 27th ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/1559845.1559923",
	isbn          = "978-1-60558-551-2",
	pages         = "745--758",
	publisher     = "{ACM}",
	title         = "{FlexRecs: expressing and combining flexible recommendations}",
	year          = 2009,
}