@book{4996,
	author = {Tokheim, Roger.},
	title = {Schaum's outline of digital  /},
	publisher = {McGraw-Hill,},
	year = {2010.},
	address = {[S.l.] :},
	edition = {6h ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0070650500/chopaconline-20}
}