1. Bernstein-type operators diminish the φ-variation;Adell;Constr. Approx.,1996
2. Sur l'aproximation des foctions convexes d'ordre supèrieur;Popoviciou;Mathematica,1935
3. The asymptotic properties of the approximation of functions with Bernstein polynomials;Voronovskaja;Dokl. Akad. Nauk. SSSR,1932