@inbook {17084,
	title = {Direct manipulation user interfaces for expert systems},
	booktitle = {Expert systems: the user interfaceExpert systems: the user interface},
	year = {1987},
	month = {1987///},
	pages = {99 - 125},
	author = {Baroff,J. and Simon,R. and Gilman,F. and Shneiderman, Ben}
}
