1. The Theory of Splines and their Applications;Ahlberg,1967
2. Curve and surface fitting based on variational criteria for smoothness;Mehlum,1969
3. Analytic Definition of Curves and Surfaces by Parabolic Blending;Overhauser,1968
4. Example of an existing system in the motor industry: the Unisurf system;Bézier,1971
5. Bernstein - Bezier methods for the computer-aided design of free-form curves and surfaces;Riesenfeld,1973