@book {16928,
	title = {A Graphical Filter/flow Representation of Boolean Queries: A Prototype Implementation},
	year = {1992},
	month = {1992///},
	publisher = {University of Maryland, Center for Automation Research, Computer Vision Laboratory},
	organization = {University of Maryland, Center for Automation Research, Computer Vision Laboratory},
	author = {Young,D. and Shneiderman, Ben}
}
