1. Agrawal, S. K., 1990, “Rate Kinematics of In-parallel Manipulator Systems,” Proc. of the IEEE Int. Conf. on Robotics and Automation, Vol. 1, pp. 104–109.
2. Burdick, J. W., 1991, “A Classification of 3R Regional Manipulator Singularities and Geometries,” Proc. of the IEEE Int. Conf. on Robotics and Automation, pp. 2670–2675.
3. Collins, C. L., and Long, G. L., 1994, “Line Geometry and the Singularity Analysis of an In-parallel Hand Controller for Force Reflected Teleoperation,” ASME 23rd Mechanisms Conf., DE-Vol. 72, pp. 361–369.
4. Davies T. H. , 1981, “Kirchhoff Circulation Law Applied to Multi-loop Kinematic Chains,” Mech. and Mach. Theory, Vol. 16, pp. 171–183.
5. Freudenstein F. , 1962, “On the Variety of Motions Generated by Mechanisms,” ASME Journal of Engineering for Industry, Vol. 84, pp. 156–160.