1. Autodesk Corporation, http://www.autodesk.com/.
2. An introduction to splines for use in computer graphics and geometric modeling;Bartels,1987
3. An introduction to the curves and surfaces of computer-aided design;Beach,1991
4. Computer integrated design and manufacturing;Bedworth,1991
5. CAD/CAM Curriculum. Design Automation Lab. Department of Mechanical and Aerospace Engineering, Arizona State University, http://asudesign.eas.asu.edu/education/curriculum.html.