@book{31516,
	author = {Hill, Fredrick J. and Peterson, Gerald R.,},
	title = {Introduction to switching theory and logical design /},
	publisher = {Wiley,},
	year = {c1981.},
	address = {New York :},
	edition = {3d ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0608/80020333-d.html}
}