M.  Bergamasco, Dario, P., Bicchi, A., and Buttazzo, G., ?Multi Sensor Integration for Fine Manipulation?, in Highly Redundant Sensing in Robotic Systems, vol. 58, J. T.  Tou and Balchen, J. G., Eds. Berlin Heidelberg, Germany: Springer Verlag, 1990, pp. 55-66.