@inbook {reference/db/Vakali09,
	title = {Access Control Policy Languages},
	booktitle = {Encyclopedia of Database Systems},
	year = {2009},
	pages = {15-18},
	publisher = {Springer US},
	organization = {Springer US},
	isbn = {978-0-387-39940-9},
	author = {Athena Vakali},
	editor = {Liu, Ling and Ozsu, M. Tamer}
}