@book{40720,
	author = {Preparata, Franco P. and Yeh, Raymond Tzuu-Yau},
	title = {Introduction to discrete structures for computer science and engineering},
	publisher = {Addison-Wesley Pub. Co.},
	year = {[1973]},
	series = {Addison-Wesley series in computer science and information processing},
	address = {Reading, Mass.},
	note = {920327}
}