%0 Journal Article
%A I. I. Pleshkan
%T A new method of investigation on the isochronism of a system of differential equations
%J Doklady Akademii Nauk
%D 1968
%P 768-771
%V 182
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1968_182_4_a7/
%G ru
%F DAN_1968_182_4_a7