@inproceedings{JCDL-2001-Sullivan,
	author        = "Terry Sullivan",
	booktitle     = "{Proceedings of the First Joint Conference on Digital Libraries}",
	doi           = "10.1145/379437.379669",
	isbn          = "1-58113-345-6",
	pages         = "251--252",
	publisher     = "{ACM}",
	title         = "{Locating question difficulty through explorations in question space}",
	year          = 2001,
}