1. The theory of approximation;Jackson,1930
2. Bernstein polynomials;Lorentz,1953
3. Joint approximation of a function and its derivatives by algebraic polynomials;Malozemov;Dokl. Akad. Nauk. SSSR,1966
4. Monotone and weighted approximation;Roulier,1968
5. Monotone approximation;Shisha;Pacific J. Math.,1965