1. J.A. Adell, F.G. Badía and J. de la Cal, Beta-type operators preserve shape properties, Stochastic Process. Appl. (to appear).
2. J.A. Adell and J. de la Cal, Using stochastic processes for studying Bernstein-type operators, Rend. Circ. Mat. Palermo, (to appear).
3. J.A. Adell and J. de la Cal, Approximating gamma distributions by normalized negative binomial distributions, J. Appl. Probab., (to appear).
4. G.A. Anastassiou, C. Cottin and H.H. Gonska, Global smoothness of approximating functions, Analysis
11 (1991), 43–57.
5. G.A. Anastassiou, C. Cottin and H.H. Gonska, Global smoothness preservation by multivariate approximation operators, in: “Israel Math. Conf. Proceedings” (1991).