CONTROL ENGINEERING PRACTICE, vol. 6, no. 10, page. 1193 - 1208, 1998-10
SENSORS AND ACTUATORS A-PHYSICAL, vol. 65, no. 2-3, page. 203 - 208, 1998-03-15
INTELLIGENT AUTOMATION AND SOFT COMPUTING, vol. 4, no. 2, page. 147 - 161, 1998-01
FIELD AND SERVICE ROBOTICS, page. 356 - 363, 1998-01