1. On the degree of approximation by Bernstein polynomials;Groetsch;J. Approximation Theory,1975
2. Bernstein polynomials;Lorentz,1953
3. Sur l'approximation des fonctions convexes d'ordre supérieur;Popoviciu;Mathematica (Cluj),1935
4. On the degree of approximation of functions in C1[0, 1] by Bernstein polynomials, T.H.;Schurer,1975
5. Über den Grad der Approximation mit Bernstein;Sikkema;Polynomen, Num. Math.,1959