@book{32895,
	author = {Gabel, Robert A. and Roberts, Richard A.,},
	title = {Signals and linear systems /},
	publisher = {Wiley,},
	year = {c1987.},
	address = {New York :},
	edition = {3rd ed.},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/description/wiley031/86007748.html}
}