TY  - BOOK
AU  - Nayfeh, Ali Hasan
TI  - Problems in Perturbation
SN  - 0471822922
U1  - 515.35 
PY  - 1985///
CY  - New York
PB  - John Wiley & Sons
KW  - Differential Equations-Numerical solutions
KW  - Perturbation(mathematics
ER  -