@book{7118,
	author = {Ranjan, I Nagrath,S. Sharan R.},
	title = {Signals and systems, second edition /},
	publisher = {Tata Mcgraw Hill,},
	year = {2009.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/0070141096/chopaconline-20}
}