%0 Journal Article %A P. I. Lizorkin %A S. M. Nikol'skii %T Approximation by spherical functions %J Informatics and Automation %D 1986 %P 181-189 %V 173 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1986_173_a14/ %G ru %F TRSPY_1986_173_a14