%0 Journal Article
%A E. S. Kostenko
%T Group properties of ordinary second order linear differential equations
%J Differencialʹnye uravneniâ
%D 1972
%P 727-730
%V 8
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1972_8_4_a19/
%G ru
%F DE_1972_8_4_a19