TY  - JOUR
AU  - H. Hofer
TI  - Estimates for the energy of a symplectic map.
JO  - Commentarii mathematici Helvetici
PY  - 1993
SP  - 48
EP  - 72
VL  - 68
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1993__68_2_140293/
ID  - CMH_1993__68_2_140293
ER  -