%0 Journal Article
%A Li,  Qiang
%A Li,  Yongxiang
%T Existence and multiplicity of positive periodic solutions for second-order functional differential equations with infinite delay
%J Electronic journal of differential equations
%D 2014
%V 2014
%U http://geodesic.mathdoc.fr/item/EJDE_2014__2014__a78/
%G en
%F EJDE_2014__2014__a78