@inproceedings{SIGMOD-2000-AgrawalW,
	author        = "Rakesh Agrawal and Edward L. Wimmers",
	booktitle     = "{Proceedings of the 30th ACM SIGMOD International Conference on Management of Data}",
	doi           = "10.1145/342009.335423",
	isbn          = "1-58113-217-4",
	pages         = "297--306",
	publisher     = "{ACM}",
	title         = "{A Framework for Expressing and Combining Preferences}",
	year          = 2000,
}