@inproceedings{SIGIR-2009-KapteinKK,
	author        = "Rianne Kaptein and Marijn Koolen and Jaap Kamps",
	booktitle     = "{Proceedings of the 32nd International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/1571941.1572147",
	isbn          = "978-1-60558-483-6",
	pages         = "824--825",
	publisher     = "{ACM}",
	title         = "{Using wikipedia categories for ad hoc search}",
	year          = 2009,
}