@book{4260,
	author = {R., Gopal.},
	title = {Problems and solutions in signals and systems /},
	publisher = {CBS Publishers & Distributors Pvt.ltd.,},
	year = {2008.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/8123911459/chopaconline-20}
}