@inproceedings{VLDB-1997-ClaussenKMP,
	author        = "Jens Claußen and Alfons Kemper and Guido Moerkotte and Klaus Peithner",
	booktitle     = "{Proceedings of the 23rd International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/1997/P286.PDF",
	isbn          = "1-55860-470-7",
	pages         = "286--295",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Optimizing Queries with Universal Quantification in Object-Oriented and Object-Relational Databases}",
	year          = 1997,
}