@Article{The_Role_of_User_Models_in_Cooperative_Interactive_Systems,
	author = "Robert Kass and Tim Finin",
	title = "{The Role of User Models in Cooperative Interactive Systems}",
	month = "January",
	year = "1989",
	pages = "81-112",
	number = "1",
	volume = "4",
	journal = "International Journal of Intelligent Systems",
	publisher = "Wiley",
}