2) M. Topping and J. Smith, The Development of Handy1, a Robotic System to Assist the Severely Disabled. Sixth International Conference on Rehabilitation Robotics 1999; 244-249.
3) M. Topping, Handy1, A Robotic Aid to Independence for Severely Disabled People. Integration of Assistive Technology in the Information Age 2001; 142-147.
5) J. Sijs, F. Liefhebber and G. Romer, Combined Position & Force Control for a robotic manipulator. IEEE 10th International Conference on Rehabilitation Robotics 2007; 106-111.