@conference {538,
	title = {Pricing Information Goods in Distributed Agent-based Information Filtering},
	booktitle = {Proceedings of the 19th International Conference on Cooperative Information Systems (CoopIS)},
	year = {2011},
	month = {October},
	address = {Crete, Greece},
	author = {Christos Tryfonopoulos and Laura Maria Andreescu}
}
