1. Arndt, H.: Interpolation mit regulären Splines, J. Approximation Theory 20 (1974), 23–45
2. Arndt, H./Eickenscheidt, B.: Zur Konvergenz von Splines, ISNM 30 (1976), 35–42
3. De Boor, C.: Package for Calculating with B-Splines, SIAM J. Numer. Anal. 14 (1977), 441–472
4. Karlin, S.: Total Positivity, vol. 1, Stanford 1968
5. Karlin, S./Studden, W.J.: Tchebycheff Systems: with Applications in Analysis and Statistics, New York-London-Sydney, 1966