%0 Journal Article %A M.-B. Babayev %T The approximation of sobolev classes of functions by sums of products of functions of fewer variables %J Informatics and Automation %D 1987 %P 30-32 %V 180 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1987_180_a8/ %G ru %F TRSPY_1987_180_a8