1. The NURBS Book;Piegl,1997
2. Curves and surfaces for CAGD;Farin,1999
3. T-splines and t-NURCCs;Sederberg;ACM Trans. Graph,2003
4. Implicit curves and surfaces in CAGD;Hoffmann;IEEE Comput. Graphics Appl.,1993
5. Implicitization using moving curves and surfaces;Sederberg,1995