Geodesic
Order of approximation of functions of the class $Z_2(E^n)$ by linear positive convolution operators
Matematičeskie zametki, Tome 7 (1970) no. 6, pp. 723-732 Cet article a éte moissonné depuis la source Math-Net.Ru

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An estimate is obtained of the order of approximation of functions of the class $Z_2(E^n)$ by linear positive convolution operators specified by a class of nonnegative functions whose Fourier transforms have support concentrated in a closed region of $n$-dimensional Euclidean space. 
@article{MZM_1970_7_6_a8,
     author = {A. I. Kamzolov},
     title = {Order of approximation of functions of the class $Z_2(E^n)$ by linear positive convolution operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {723--732},
     year = {1970},
     volume = {7},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_6_a8/}
}
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A. I. Kamzolov. Order of approximation of functions of the class $Z_2(E^n)$ by linear positive convolution operators. Matematičeskie zametki, Tome 7 (1970) no. 6, pp. 723-732. http://geodesic.mathdoc.fr/item/MZM_1970_7_6_a8/