@inbook {boudin_using_2012,
	title = {Using a medical thesaurus to predict query difficulty},
	booktitle = {Advances in Information Retrieval},
	year = {2012},
	pages = {480{\textendash}484},
	publisher = {Springer Berlin Heidelberg},
	organization = {Springer Berlin Heidelberg},
	url = {http://link.springer.com/chapter/10.1007/978-3-642-28997-2_46},
	author = {Boudin, Florian and Jian-Yun Nie and Dawes, Martin}
}
