TY  - BOOK
AU  - Nayfeh, Ali Hasan
AU  - 
TI  - Perturbation methods
T2  - Pure and Applied Mathematics
U1  - 515.73 
PY  - 1973///
CY  - New York
PB  - John Wiley
N1  - "A Wiley Interscience publication"
ER  -