1. Preservation of moduli of continuity for Bernstein-type operators;Adell,1994
2. Bernstein-type operators diminish theϕ;Adell;Constr. Approx.,1996
3. On the property of monotonic convergence for Beta operators;Adell;J. Approx. Theory,1996
4. J. A. Adell, A. Pérez-Palomares, Global smoothness preservation properties for generalized Szász–Kantorovich operators, 1996
5. Global smoothness of approximating functions;Anastassiou;Analysis,1991