@inproceedings{PODS-2003-Behrend,
	author        = "Andreas Behrend",
	booktitle     = "{Proceedings of the 22nd Symposium on Principles of Database Systems}",
	doi           = "10.1145/773153.773164",
	isbn          = "1-58113-670-6",
	pages         = "102--110",
	publisher     = "{ACM}",
	title         = "{Soft stratification for magic set based query evaluation in deductive databases}",
	year          = 2003,
}