%0 Journal Article
%A V. V. Amel'kin
%A K. M. Al-Haider
%T Strong isochronism of polynomial differential systems with a center
%J Differencialʹnye uravneniâ
%D 1999
%P 867-873
%V 35
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DE_1999_35_7_a0/
%G ru
%F DE_1999_35_7_a0