@book{7052,
	author = {Stern, Harold P.E. and Mahmoud, Samy A},
	title = {Communication Systems :},
	publisher = {Prentice Hall,},
	year = {2003.},
	address = {[S.l.] :},
	edition = {1st ed.},
	url = {http://www.amazon.com/exec/obidos/ASIN/0130402680/chopaconline-2}
}