Closed geodesics for the Jacobi metric and periodic solutions of prescribed energy of natural hamiltonian systems
Normal modes of a lagrangian system constrained in a potential well
Periodic bounce trajectories with a low number of bounce points
On the geodesic connectedeness of Lorentzian manifolds.
On the existence of multiple geodesics in static space-times
The Dirichlet problem for harmonic maps from the disk into the euclidean n-sphere
On the existence of geodesics in static Lorentz manifolds with singular boundary
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