TY  - JOUR
AU  - L.H. Eliasson
TI  - Normal forms for Hamiltonian systems with Poisson commuting integrals - elliptic case.
JO  - Commentarii mathematici Helvetici
PY  - 1990
SP  - 4
EP  - 35
VL  - 65
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMH_1990__65_3_140179/
ID  - CMH_1990__65_3_140179
ER  -