%0 Journal Article
%A Maria Letizia Bertotti
%T Multiplicity of Subharmonic solutions of Forces Hamiltonian systems near an equilibrium.
%J Manuscripta mathematica
%D 1989
%P 389-402
%V 64
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MM2_1989__64_2_155414/
%F MM2_1989__64_2_155414