@book{33471,
	author = {Landau, Yoan D., and Zito, Gianluca},
	title = {Digital control systems :},
	publisher = {Springer,},
	year = {2006},
	address = {London ;},
	url = {http://www.loc.gov/catdir/enhancements/fy0663/2005931921-d.html}
}