1. Abramowitz, M. & I. Stegun,Handbook of Mathematical Functions, 9th print., Dover Publ., New York 1970
2. Reg. Conf. Series in Appl. Math.;R. Askey,1975
3. de Boor, C., Spines as linear combinations ofB-splines. A survey, inApproximation Theory II — Conference, Academic Press, Inc., New York 1976, 1–47
4. Gasper, G., Positive sums of the classical orthogonal polynomials,SIAM J. Math. Anal. 8 (1977), 423–447
5. Golubov, B. I., On Abel-Poisson type and Riesz means,Analysis Mathematica 7 (1981), 161–184