1. The theory of splines and their applications;Ahlbert,1967
2. Improved orders of approximation derived from interpolatory cubic splines;Behforooz;BIT,1979
3. G. Behforooz, and N. Papamichael, Superconvergence properties of quintic interpolatory splines, Report TR/97, Department of Mathematics, Brunel University, Uxbridge, England.
4. A Practical Guide to Splines;Carl de Boor,1978
5. Quadratic interpolatory splines;Kammerer;Numer. Math.,1974