%0 Journal Article
%A L. V. Ovsyannikov
%T Groups and invariant-group solutions of differential equations
%J Doklady Akademii Nauk
%D 1958
%P 439-442
%V 118
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1958_118_3_a5/
%G ru
%F DAN_1958_118_3_a5