1. ABRAMOWITZ, M., and I. A. STEGUN: Handbook of mathematical functions. New York: Dover Publ. 1965
2. BUTZER, P. L.: Linearcombinations of Bernstein polynomials. Canad. J. Math.5, 559?567 (1953)
3. BUTZER, P. L., and R. J. NESSEL: Fourier Analysis and Approximation, Vol I. Basel: Birkh�user 1971
4. DAVIS, P. J.: Interpolation and Approximation. New York: Blaisdell Publ. 1963
5. FRENTIU, M.: Linear combinations of Bernstein polynomials and of Mirakjan operators (Rum�nisch). Studia Univ. Babes-Bolyai Ser. Math.-Mech.15, 63?68 (1970)