%0 Journal Article
%A A. I. Bulgakov
%T On the oscillation of solutions of systems of second-order differential equations
%J Differencialʹnye uravneniâ
%D 1987
%P 204-217
%V 23
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1987_23_2_a3/
%G ru
%F DE_1987_23_2_a3