@book{644,
	author = {Ercegovac, Miloš D. and Lang, Tomás.},
	title = {Introduction to digital systems /},
	publisher = {John Wiley Sons,},
	year = {c1999.},
	address = {New York :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/description/wiley033/98024462.html}
}