@book{6175,
	author = {Haykin, Simon S.,},
	title = {An introduction to analog and digital communications /},
	publisher = {Wiley,},
	year = {c1989.},
	address = {New York :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/description/wiley032/88015512.html}
}