@book{93359,
	author = {Karris, Steven T. and ebrary, Inc.},
	title = {Signals and systems},
	publisher = {Orchard,},
	year = {2003.},
	address = {Fremont, Calif. :},
	edition = {2nd ed.},
	url = {http://site.ebrary.com/lib/strathmore/Doc?id=10080439}
}