@article{GDZPPN002101831,
title = {Periodic solutions with prescribed minimal period for convex autonomous hamiltonian systems.},
journal = {Inventiones mathematicae},
volume = {82},
year = {1985},
pages = {155-188},
zbl = {0594.58035},
url = {http://dml.mathdoc.fr/item/GDZPPN002101831}
}
Hofer, H.; Ekeland, I. Periodic solutions with prescribed minimal period for convex autonomous hamiltonian systems.. Inventiones mathematicae, Tome 82 (1985) pp. 155-188. http://gdmltest.u-ga.fr/item/GDZPPN002101831/