@book{217714,
	author = {Haykin, Simon S., and Van Veen, Barry.},
	title = {Signals and systems   (E-BOOK)},
	publisher = {Wiley,},
	year = {c1998.},
	address = {New York :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0706/97052090-d.html}
}