@inproceedings{CIKM-2008-Croft,
	author        = "W. Bruce Croft",
	booktitle     = "{Proceedings of the 17th ACM International Conference on Information and Knowledge Management}",
	doi           = "10.1145/1458082.1458085",
	isbn          = "978-1-59593-991-3",
	pages         = "1001",
	publisher     = "{ACM}",
	title         = "{Unsolved problems in search: (and how we approach them)}",
	year          = 2008,
}