@article{GDZPPN002068613,
title = {Estimates for the energy of a symplectic map.},
journal = {Commentarii mathematici Helvetici},
volume = {68},
year = {1993},
pages = {48-72},
zbl = {0787.58017},
url = {http://dml.mathdoc.fr/item/GDZPPN002068613}
}
Hofer, H. Estimates for the energy of a symplectic map.. Commentarii mathematici Helvetici, Tome 68 (1993) pp. 48-72. http://gdmltest.u-ga.fr/item/GDZPPN002068613/