%0 Journal Article %A V. V. Grushin %T A problem in the entire space for a certain class of partial differential equations %J Doklady Akademii Nauk %D 1962 %P 1251-1254 %V 146 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1962_146_6_a1/ %G ru %F DAN_1962_146_6_a1