@book{4178,
	author = {Gurung, J.B.},
	title = {Signals and systems /},
	publisher = {PHI Learning,},
	year = {2009.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/8120334221/chopaconline-20}
}