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2. Example of an Existing System in Motor Industry, The UNISURF System;Bezier,1971
3. S. E. Razavi “Computer Aided Manufacture in a DNC Cell”, Ph.D. Thesis, the University of Aston in Birmingham, Birmingham, England.
4. B-spline Curves and Surfaces;Gordon,1974
5. The Numerical Evaluation of B-splines;Cox,1971