@inproceedings{SIGIR-2008-ZhuCC,
	author        = "Yangbo Zhu and Jamie Callan and Jaime G. Carbonell",
	booktitle     = "{Proceedings of the 31st International ACM SIGIR Conference on Research and Development in Information Retrieval}",
	doi           = "10.1145/1390334.1390466",
	isbn          = "978-1-60558-164-4",
	pages         = "715--716",
	publisher     = "{ACM}",
	title         = "{The impact of history length on personalized search}",
	year          = 2008,
}