%0 Journal Article
%A Huang, Chuangxia
%A Huang, Lihong
%A Meng, Yimin
%T Periodic solutions for planar systems with time-varying delays
%J Electronic Journal of Differential Equations
%D 2005
%V 2005
%I mathdoc
%U http://geodesic.mathdoc.fr/item/EJDE_2005__2005__a149/
%G en
%F EJDE_2005__2005__a149