TY  - DATA
AU  - Llibre, Jaume.
AU  - Nunes, Ana,
TI  - Separatrix surfaces and invariant manifolds of a class of integrable Hamiltonian systems and their perturbations 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9781470400903 (online)
PY  - 1994///
CY  - Providence, R.I.
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0513
ER  -