@inproceedings{SIGIR-2011-Azzopardi,
	author        = "Leif Azzopardi",
	booktitle     = "{Proceedings of the 34th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/2009916.2009923",
	isbn          = "978-1-4503-0757-4",
	pages         = "15--24",
	publisher     = "{ACM}",
	title         = "{The economics in interactive information retrieval}",
	year          = 2011,
}