@article {16722,
	title = {The Opsis project: materialized views for data warehouses and the web},
	journal = {Advances in Informatics},
	year = {2003},
	month = {2003///},
	pages = {64 - 81},
	author = {Roussopoulos, Nick and Kotidis,Y. and Labrinidis,A. and Sismanis,Y.}
}
