@book{1571,
	author = {Proakis, John G and Salehi, Masoud},
	title = {Digital communications /},
	publisher = {McGraw-Hill,},
	year = {2008},
	address = {Boston :},
	edition = {5th ed},
	url = {http://catdir.loc.gov/catdir/enhancements/fy0803/2007036509-d.html}
}