1. Chen, C. H., 1985, Fundamentals of the Theory of Conjugate Surfaces, Science Press, Beijing (in Chinese).
2. Phillips, J., 1984, Freedom in Machinery, Introducing Screw Theory, Cambridge University Press, New York.
3. McCarthy, J. M., 1990, Introduction to Theoretical Kinematics, MIT Press, Cambridge, MA.
4. Chen, C. H., and Chen, H. J., 1992, “Motion Representation: Different Conventional Forms, Duplex Mapping And Conjugation Form,” Flexible Mechanisms, Dynamics, and Analysis, ASME DE-VOL. 47, ASME, New York, pp. 283–294.
5. Duffy, J., 1980, Analysis of Mechanisms and Robotic Manipulators, John Wiley and Sons, Inc., New York.