1. The Theory of Splines and Their Applications;Ahlberg,1967
2. A Practical Guide to Splines;de Boor,1978
3. Spline Functions: Basic Theory;Schumaker,1980
4. A bicubic spline interpolation of unequally spaced data;Christie;Computer Physics Communications,1979
5. Multidimensional additive spline approximation;Friedman;SIAM Journal on Scientific and Statistical Computing,1983