1. Inverse theorems for Bernstein polynomials;Berens;Indiana Univ. Math. J.,1971
2. Multivariate Durrmeyer-Bernstein operators;Chen;Israel Mathematics Conference Proceedings,1991
3. Chen, W., Z. Ditzian and K. Ivanov – Strong converse inequality for the Bernstein-Durrmeyer operator, Jour. of Approx. Theory (to appear).
4. On multivariate approximation by Bernstein-type polynomials;Derriennic;Jour. of Approx. Theory,1985
5. Derriennic, M.M. – Linear combinations of derivatives of Bernstein-type polynomials on a simplex, (to appear).