TY  - JOUR
AU  - S. V. Bolotin
AU  - V. V. Kozlov
TI  - Topology, singularities and integrability in Hamiltonian systems with two degrees of freedom
JO  - Izvestiya. Mathematics 
PY  - 2017
SP  - 671
EP  - 687
VL  - 81
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_2017_81_4_a0/
LA  - en
ID  - IM2_2017_81_4_a0
ER  -