@inproceedings{VLDB-2002-KiesslingK,
	author        = "Werner Kießling and Gerhard Köstler",
	booktitle     = "{Proceedings of the 28th International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/2002/S30P03.pdf",
	pages         = "990--1001",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Preference SQL — Design, Implementation, Experiences}",
	year          = 2002,
}