1. Bézier, P.E.: Numerical Control: Mathematics and Applications. John Wiley, New York (1972)
2. Davis, P.J.: Interpolation and Approximation. Dover Pub. Inc., New York (1975)
3. Farin, G.: Curves and Surfaces for Computer Aided Geometric Design. Academic Press, San Diego (1993)
4. de Boor, C.: A Practical Guide to Spline. Springer-Verlag, New York (1985)
5. Kvasov, B.I.: Methods of Shape-Preserving Spline Approximation. World Scientific, Singapore (2000)