@booklet {GreTR02,
	title = {Variable Structure Control for Singularly Perturbed System: Stability Issues},
	year = {2002},
	month = {March},
	publisher = {Dept. of Electrical Systems and Automation, University of Pisa},
	address = {Pisa, Italy},
	keywords = {Robotics},
	author = {M. Innocenti and L. Greco}
}
