@inproceedings{SIGIR-2013-AzzopardiKB,
	author        = "Leif Azzopardi and Diane Kelly and Kathy Brennan",
	booktitle     = "{Proceedings of the 36th International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/2484028.2484049",
	isbn          = "978-1-4503-2034-4",
	pages         = "23--32",
	publisher     = "{ACM}",
	title         = "{How query cost affects search behavior}",
	year          = 2013,
}