@book{249143,
	author = {Karris, Steven T. and ebrary, Inc.},
	title = {Signals and systems},
	publisher = {Orchard Publications,},
	year = {2012.},
	address = {Fremont, CA :},
	edition = {3rd ed.},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10547416}
}