%0 Journal Article
%A Bonanno,  Gabriele
%A Livrea,  Roberto
%T Periodic solutions for a class of second-order Hamiltonian systems
%J Electronic journal of differential equations
%D 2005
%V 2005
%U http://geodesic.mathdoc.fr/item/EJDE_2005__2005__a115/
%G en
%F EJDE_2005__2005__a115