1. Kinematotropic linkages;Wohlhart,1996
2. Single-loop kinematotropic mechanisms;Galletti;Mech. Mach. Theory,2001
3. Parallel robots that change their group of motion;Fanghella,2006
4. Modified wren platforms;Kiper,2011
5. Type synthesis of variable degree-of-freedom parallel manipulators with both planar and 3T1R operation modes;Kong,2012