%0 Journal Article %A S. F. Morozov %A V. I. Sumin %T Criterion for the compactness of a class of functions of $W_m^l$ ($1 %J Matematičeskie zametki %D 1970 %P 733-741 %V 7 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1970_7_6_a9/ %G ru %F MZM_1970_7_6_a9