%0 Journal Article
%A I. A. Pavlyuk
%T The investigation of nonautonomous systems of second order differential equations by means of differential invariants
%J Differencialʹnye uravneniâ
%D 1968
%P 1785-1800
%V 4
%N 10
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1968_4_10_a3/
%G ru
%F DE_1968_4_10_a3