@article {583,
	title = {Information Filtering and Query Indexing for an Information Retrieval Model},
	journal = {ACM Transactions on Information Systems (TOIS)},
	volume = {27},
	year = {2009},
	pages = {1{\textendash}47},
	author = {Christos Tryfonopoulos and Manolis Koubarakis and Yannis Drougas}
}
