P.  Dario, Bicchi, A., Fiorillo, A., Buttazzo, G., and Francesconi, R., ?A Sensorized Scenario for Basic Investigation on Active Touch?, in Robot Sensors: Tactile and Non-Vision, A.  Pugh, Ed. Kempston, Bedford, U. K.: I. F. S. Publications Ltd., 1986, pp. 237-245.