1. W. Daren, Differential Coefficient Geometry Theory, People Education Press, Beijing, 1981.
2. Mathematical Department of Fudan University, Curve and Curve Surface, Science, Moscow, February 1977.
3. L. Xuechuan, AutoLISP Practical Book, People’s Post Press, Beijing, September 1998.
4. W. Zhongqing, Development of integrated multitask intelligent CAD system for tools, Machinery 37 (6) (1999) 418.
5. W. Zhongqing, Intelligent parametric variables CAD plotting for cutting tool system, Machinery 36 (9) (1998) 408.