Coincidence of classes of functions defined by the generalized shift operator or by the order of best polynomial approximation
Matematičeskie zametki, Tome 66 (1999) no. 2, pp. 242-257.

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M. K. Potapov. Coincidence of classes of functions defined by the generalized shift operator or by the order of best polynomial approximation. Matematičeskie zametki, Tome 66 (1999) no. 2, pp. 242-257. http://geodesic.mathdoc.fr/item/MZM_1999_66_2_a11/

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