@inproceedings{SIGIR-2009-ScholerG,
	author        = "Falk Scholer and Steven Garcia",
	booktitle     = "{Proceedings of the 32nd International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/1571941.1572055",
	isbn          = "978-1-60558-483-6",
	pages         = "640--641",
	publisher     = "{ACM}",
	title         = "{A case for improved evaluation of query difficulty prediction}",
	year          = 2009,
}