%0 Journal Article
%A D. S. Ushkho
%T Qualitative investigation of a system with three centers
%J Differencialʹnye uravneniâ
%D 1984
%P 797-801
%V 20
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1984_20_5_a6/
%G ru
%F DE_1984_20_5_a6