1. S. N. Bernstein,Complétement a l'article de E. Voronowskaja, C. R. Acad. Sci. U.R.S.S., (1932), pp. 86–92.
2. P. L. Butzer,Linear combinations of Bernstein polynomials, Can. J. Math., 5 (1953), pp. 559–567.
3. R. De Vore and G. Lorentz,Constructive Approximation, Springer-Verlag, Berlin, 1991.
4. Z. Ditzian,A global inverse theorem for combinations of Bernstein polynomials, J. Approximation Theory, 26 (1979), pp. 277–292.
5. H. Engels,Numerical Quadrature and Cubature, Acad. Press, London, 1980.