Geodesic
On conditions for and the order of approximation of functions by operators of class $S_{2m}$
Matematičeskie zametki, Tome 67 (2000) no. 5, pp. 654-661.

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V. A. Baskakov. On conditions for and the order of approximation of functions by operators of class $S_{2m}$. Matematičeskie zametki, Tome 67 (2000) no. 5, pp. 654-661. http://geodesic.mathdoc.fr/item/MZM_2000_67_5_a1/

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