TY  - BOOK
AU  - Nayfeh ,Ali Hasan
TI  - Nonlinear oscillations
SN  - 0471035556
U1  - 531.322 
PY  - 1979///
CY  - New York
PB  - John Wiley &Sons ,Inc
KW  - System Analysis
KW  - Nonlinear Theories
ER  -