@book{450,
	author = {Gautam, A.K.},
	title = {Communication Systems},
	publisher = {S. K. Kataria & Sons,},
	year = {2010.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/8188458856/chopaconline-20}
}