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On the rate of convergence of certain approximation operators. Popa, Emil C. (2002) General Mathematics
On the rate of pointwise convergence of Szász-Mirakyan operators Paulina Pych-Taberska (1989) Banach Center Publications
Operator semigroups and Poisson convergence in selected metrics. D. Pfeifer, P. Deheuvels (1986/1987) Semigroup forum
Order of approximation of functions of two variables by new type gamma operators. Izgi, Aydin (2009) General Mathematics
Pointwise approximation by Meyer-König and Zeller operators Xiao-Ming Zeng, Jun-Ning Zhao (2000) Annales Polonici Mathematici We study the rate of pointwise convergence of Meyer-König and Zeller operators for bounded functions, and get an asymptotically optimal estimate.
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Positive approximation and interpolation using compactly supported radial basis functions. Wu, Jinming, Zhang, Xiaolei, Peng, Lihui (2010) Mathematical Problems in Engineering