%0 Journal Article
%A N. H. Ibragimov
%T On the group classification of second order differential equations
%J Doklady Akademii Nauk
%D 1968
%P 274-277
%V 183
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1968_183_2_a6/
%G ru
%F DAN_1968_183_2_a6