1. Ditzian, Z., Totik, V.: Moduli of Smoothness. Springer, New York (1987)
2. Derriennic, M.-M.: Modifed Bernstein polynomials and Jacobi polynomials in q-calculus. Rend. Circ. Mat. Palermo (II)(Suppl. 76), 269–290 (2005)
3. II’nskii, A., Ostrovska, S.: Convergence of generalized Bernstein polynomials. J. Approx. Theory 116, 100–112 (2002)
4. Lewanowicz, S., Wozny, P.: Generalized Bernstein polynomials. BIT 44, 63–78 (2004)
5. Lupaş, A.: A q-analogue of the Bernstein operator. In: Seminar on Numerical and Statistical Calculus, vol. 9, University of Cluj-Napoca (1987)