1. Determination of geometrical invariants of rational parametrized conic sections;Albrecht,2001
2. NURB Curves and Surfaces: from Projective Geometry to Practical Use;Farin,1999
3. Curves and Surfaces for Computer Aided Geometric Design;Farin,2001
4. The Essentials of CAGD;Farin,2000
5. Fundamentals of Computer Aided Geometric Design;Hoschek,1993