TY  - JOUR
AU  - V. S. Matveev
TI  - Integrable Hamiltonian system with two degrees of freedom. The~topological structure of saturated neighbourhoods of points of focus-focus and saddle-saddle type
JO  - Sbornik. Mathematics
PY  - 1996
SP  - 495
EP  - 524
VL  - 187
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1996_187_4_a1/
LA  - en
ID  - SM_1996_187_4_a1
ER  -