Geodesic
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 
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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     title = {Coincidence of classes of functions defined by the generalized shift operator or by the order of best polynomial approximation},
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