TY  - BOOK
AU  - Nayfeh Ali Hasan
AU  -  Mook Dean T
TI  - Nonlinear oscillations
T2  - Pure and Applied Mathematics
U1  - B85, L9 
PY  - 1979///
CY  - New York    
PB  -  John Wiley       
KW  -  Nonlinear theories
KW  - System analysis
ER  -