%0 Journal Article
%A V. V. Grushin
%T Extension of smoothness to solutions of differential equations of smooth type
%J Doklady Akademii Nauk
%D 1963
%P 1241-1244
%V 148
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1963_148_6_a1/
%G ru
%F DAN_1963_148_6_a1