%0 Journal Article %A P. I. Lizorkin %T Direct and inverse theorems of approximation theory for functions on Lobachevsky space %J Informatics and Automation %D 1992 %P 120-147 %V 194 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1992_194_a8/ %G ru %F TRSPY_1992_194_a8