@inproceedings{VLDB-1996-Cuppens,
	author        = "Frédéric Cuppens",
	booktitle     = "{Proceedings of the 22nd International Conference on Very Large Data Bases}",
	ee            = "http://www.vldb.org/conf/1996/P484.PDF",
	isbn          = "1-55860-382-4",
	pages         = "484--494",
	publisher     = "{Morgan Kaufmann}",
	title         = "{Querying a Multilevel Database: A Logical Analysis}",
	year          = 1996,
}