%0 Journal Article %A B. I. Golubov %T The approximation of a~H\"older class of two variables by Riesz spherical means %J Matematičeskie zametki %D 1974 %P 33-43 %V 15 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1974_15_1_a3/ %G ru %F MZM_1974_15_1_a3