@article{GDZPPN002437260, title = {Symplectic Topology and Hamiltonian Dynamics II.}, journal = {Mathematische Zeitschrift}, volume = {205}, year = {1990}, pages = {553-568}, zbl = {0729.53039}, url = {http://dml.mathdoc.fr/item/GDZPPN002437260} }
Hofer, Helmut; Ekeland, Ivar. Symplectic Topology and Hamiltonian Dynamics II.. Mathematische Zeitschrift, Tome 205 (1990) pp. 553-568. http://gdmltest.u-ga.fr/item/GDZPPN002437260/