TY  - JOUR
AU  - A. T. Fomenko
TI  - The topology of surfaces of constant energy in integrable Hamiltonian systems, and obstructions to integrability
JO  - Izvestiya. Mathematics 
PY  - 1987
SP  - 629
EP  - 658
VL  - 29
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1987_29_3_a6/
LA  - en
ID  - IM2_1987_29_3_a6
ER  -