1. [1] Arnold, V. I.; Avez, A. Problèmes ergodiques de la mécanique classique, Monographies Internationales de Mathématiques Modernes, 9, Gauthier-Villars, Éditeur, Paris, 1967
2. Local behavior near quasi-periodic solutions of conformally symplectic systems;Calleja, Renato C.;J. Dynam. Differential Equations,2013
3. Symplectic manifolds with disconnected boundary of contact type;Geiges, Hansjörg;Internat. Math. Res. Notices,1994
4. Examples of symplectic -manifolds with disconnected boundary of contact type;Geiges, Hansjörg;Bull. London Math. Soc.,1995
5. [5] Godbillon, Claude Éléments de topologie algébrique, Hermann, Paris, 1971