1. Sobolev Spaces;Adams,1978
2. A Practical Guide to Splines;de Boor,1978
3. Spline approximation by quasi-interpolants;de Boor;J. Approx. Theory,1973
4. Geometric Modeling with Splines: An Introduction;Cohen,2001
5. Curves and Surfaces for Computer Aided Geometric Design;Farin,1988