A.  Balestrino, Caiti, A., Calabrò, V., Crisostomi, E., and Landi, A., ?Advances in PID Control?, INTECH, 2011, pp. 85?100. 

A.  Balestrino and Bicchi, A., ?Adaptive Surface Following and Reconstruction Using Intrinsic Tactile Sensing?, in Proc. IEEE Int. Works. on Sensorial Integration for Industrial Robots, Zaragoza, Spain, 1989.