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Multiplicity of subharmonic solutions of forced Hamiltonian systems near an equilibrium
(Springer Verlag (Germany), 1989)
We prove existence and multiplicity of long time periodic solutions for a class of nonlinear nonautonomous Hamiltonian systems locally near an equilibrium solution. The result relies on a variational principle and on the ...
Multiplicity of kT-periodic solutions near a given T-periodic solution for nonlinear Hamiltonian systems
(Khayyam Publishing, 1989)