TY - JOUR AU - B. I. Golubov TI - The approximation of a~H\"older class of two variables by Riesz spherical means JO - Matematičeskie zametki PY - 1974 SP - 33 EP - 43 VL - 15 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MZM_1974_15_1_a3/ LA - ru ID - MZM_1974_15_1_a3 ER -