TY  - BOOK
AU  - Nayfeh, Alihasen.
AU  - Mook, Dean.
TI  - Nonlinear oscillations
T2  - Pure and applied mathematics
SN  - 0471035556
U1  - 531 
PY  - 1979///
CY  - New York
PB  - John Wiley and sons
ER  -