TY  - JOUR
AU  - A. T. Fomenko
TI  - A topological invariant which roughly classifies integrable strictly nondegenerate Hamiltonians on four-dimensional symplectic manifolds
JO  - Funkcionalʹnyj analiz i ego priloženiâ
PY  - 1991
SP  - 23
EP  - 35
VL  - 25
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/FAA_1991_25_4_a2/
LA  - ru
ID  - FAA_1991_25_4_a2
ER  -