TY  - BOOK
AU  - Nayfeh, Ali Hasan
TI  - Perturbation methods
SN  - 0471630594
U1  - 515.392 
PY  - 1973///
CY  - London
PB  - ; John Wiley & Sons
KW  - Mathematical Physics
KW  - Mathematics
KW  - Perturbation Theory
ER  -