TY  - JOUR
AU  - S. L. Ziglin
TI  - Splitting of the separatrices and the nonexistence of first integrals in systems of differential equations of Hamiltonian type with two degrees of freedom
JO  - Izvestiya. Mathematics 
PY  - 1988
SP  - 407
EP  - 421
VL  - 31
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1988_31_2_a7/
LA  - en
ID  - IM2_1988_31_2_a7
ER  -