%0 Journal Article %A Kh. P. Rustamov %T On the equivalence of some moduli of smoothness on a sphere %J Doklady Akademii Nauk %D 1991 %P 23-27 %V 321 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1991_321_1_a3/ %G ru %F DAN_1991_321_1_a3