%0 Journal Article
%A I. I. Pleshkan
%T On the isochronicity of systems of two differential equations whose right-hand sides contain common factors
%J Differencialʹnye uravneniâ
%D 1987
%P 981-993
%V 23
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1987_23_6_a6/
%G ru
%F DE_1987_23_6_a6