%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
%I mathdoc
%U http://geodesic.mathdoc.fr/item/EJDE_2014__2014__a78/
%G en
%F EJDE_2014__2014__a78