%0 Journal Article
%A Li,  Zhixiang
%A Wang,  Xiao
%T Existence of positive periodic solutions for neutral functional differential equations
%J Electronic journal of differential equations
%D 2006
%V 2006
%U http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a194/
%G en
%F EJDE_2006__2006__a194