1. Principles of Mechanism;Willis,1870
2. On the arrangement of the joints of crustaceous animals;Willis;Trans. Cambridge Philos. Soc.,1841
3. Displacement analysis of a spatial 7R mechanism: A generalized lobster’s arm;Duffy;ASME J. Mech. Des.,1979
4. Kinematics: past, present and future;Freudenstein;Mech. Mach. Theory,1973
5. A displacement analysis of the general spatial 7-link 7R mechanism;Duffy;Mech. Mach. Theory,1980