1. O. Aramă, “On the properties on monotonicity of the sequence of interpolation polynomials of S. N. Bernstein and their application to the study of approximation of functions,” Mathematica (Cluj), v. 2 (25), 1960, p. 25-40 (Russian).
2. M. Kac, “Une remarque sur les polynomes de M. S. Bernstein,” Studia Math., v. 7, 1938, p. 49-51.
3. Mathematical Expositions, No. 8;Lorentz, G. G.,1953
4. D. D. Stancu, “Considerations on polynomial interpolation of functions of several variables,” Bull. Univ. Babes-Bolyai (Cluj), v. 1, 1957, p. 43-82 (Rumanian).