%0 Journal Article %A A. S. Romanyuk %T Approximation of Classes of Periodic Functions in Several Variables %J Matematičeskie zametki %D 2002 %P 109-121 %V 71 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_2002_71_1_a9/ %G ru %F MZM_2002_71_1_a9