1. On some analogy between different approaches to first-order PDE's with non-smooth coefficients;Capuzzo-Dolcetta;Adv. Math. Sci. Appl.,1996
2. Fonctions à hessien borné;Demengel;Ann. Inst. Fourrier,1984
3. A few remarks on ordinary differential equations;Desjardins;Commun. Partial Differ. Eq.,1996
4. Ordinary differential equations transport theory and Sobolev spaces;DiPerna;Invent. Math.,1989
5. Hofer H., Topological properties of symplectic maps, Preprint.