1. inventor, Assembly Robot;Hiroshi;USA patent number, 4,341,502,1982
2. The Kinematics of Manipulators Under Computer Control;Pieper,1968
3. A direct comparison of the machining performance of a variax 5 axis parallel kinetic machining centre with conventional 3 and 5 axis machine tools;Geldart;Int. J. Mach. Tools Manuf.,2003
4. Hexapods for precision motion and vibration control. American Society for Precision Engineering;Anderson;Control Precision Syst. USA patent number, 4,976,582,2004
5. Switzerland, assignee. Device for the movement and positioning of an element in space;Clavel, inventor;USA patent number, 4,976,582,1990