1. Quadratische und Kubische Offset-Bézierkurven;Arnold,1986
2. The beta-spline, a local representation based on shape parameters and fundamental geometric measures;Barsky,1981
3. A survey of curve and surface methods in CAGD;Boehm;Computer Aided Geometric Design,1984
4. Methoden der numerischen Mathematik;Boehm,1985
5. Rational geometric splines;Boehm;Computer Aided Geometric Design,1987