@book{56889,
	author = {Palmer, James E. and Perlman, David E.},
	title = {Schaum's outline of theory and problems of introduction to digital systems /},
	publisher = {McGraw-Hill,},
	year = {c1993},
	series = {Schaum's outline series},
	address = {New York :},
	note = {Spine title: Introduction to digital systems},
	url = {http://www.loc.gov/catdir/toc/mh021/91046678.html}
}