1. Transversal Mappings and Flows;Abraham,1967
2. Unbounded solutions of semilinear equations at resonance;Alonso;Nonlinearity,1996
3. On the behaviour of an adiabatic invariant under a slow periodic variation of the Hamiltonian;Arnold;Sov. Math. Dokl.,1962
4. Mathematical Methods of Classical Mechanics;Arnold,1989
5. Boundedness of solutions via the twist theorem;Dieckerhoff;Ann. Scuola Norm. Sup. Pisa,1987