%0 Journal Article
%A Gu, Hua
%A An, Tianqing
%T Existence of infinitely many periodic solutions for second-order Hamiltonian systems
%J Electronic Journal of Differential Equations
%D 2013
%V 2013
%I mathdoc
%U http://geodesic.mathdoc.fr/item/EJDE_2013__2013__a94/
%G en
%F EJDE_2013__2013__a94