@inproceedings{VLDB-2002-Kiessling,
	author        = "Werner Kießling",
	booktitle     = "{Proceedings of the 28th International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/2002/S09P04.pdf",
	pages         = "311--322",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Foundations of Preferences in Database Systems}",
	year          = 2002,
}