Kasim, N. M. 2017. “Direct Estimation for Approximation by Bernstein Polynomial by Using Ditzian-Totik and Average in L Ja,h11 P < Oo Modulus of Smoothness”.
Ibn AL-Haitham Journal For Pure and Applied Sciences 21 (3): 149-58.
https://jih.uobaghdad.edu.iq/index.php/j/article/view/1417.