%0 Journal Article %A M. K. Potapov %T Coincidence of classes of functions defined by the generalized shift operator or by the order of best polynomial approximation %J Matematičeskie zametki %D 1999 %P 242-257 %V 66 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1999_66_2_a11/ %G ru %F MZM_1999_66_2_a11