@inproceedings{VLDB-2004-XuJ,
	author        = "Zhengdao Xu and Hans-Arno Jacobsen",
	booktitle     = "{Proceedings of the 30th International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/2004/DEMP9.PDF",
	isbn          = "0-12-088469-0",
	pages         = "1285--1288",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Efficient Constraint Processing for Highly Personalized Location Based Services}",
	year          = 2004,
}