@book{21876,
	author = {Philips, Charles L. and Harbor, Royce D.},
	title = {Feedback control systems /},
	publisher = {Prentice Hall,},
	year = {2000},
	address = {Upper Saddle River, N.J. :},
	edition = {4th ed.},
	note = {Includes bibliographical references and index}
}