@book{8409,
	author = {Verma, S. N.},
	title = {Automatic control systems; :},
	publisher = {Khanna,},
	year = {1999.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/B0007BZVU6/chopaconline-20}
}