TY  - BOOK
AU  - Mawhin Jean
AU  -  Willem Michel
TI  - Critical point theory and hamiltonian systems
T2  - Applied mathematical sciences; 74
U1  - B7:13, M9 
PY  - 1989///
CY  - New York    
PB  -  Springer Verlag       
KW  - Hamiltonian system
ER  -