Periodic Solutions of Superquadratic Hamiltonian Systems with Bounded Forcing Terms.
Geodesics in the compactly supported Hamiltonian diffeomorphism group.
The minimal period problem of classical hamiltonian systems with even potentials
On the density of the range for some nonlinear operators
Periodic solutions of perturbed superquadratic hamiltonian systems
Multiplicity and stability of closed geodesics on Finsler 2-spheres
A survey of recent progress on the multiplicity and stability problems for closed geodesics on Finsler 2-spheres is given.
Hyperbolic characteristics on star-shaped hypersurfaces
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