TY  - BOOK
AU  - Nayfeh Ali Hasan
TI  - Perturbation Methods
SN  - 9780471399179
U1  - 515.35 NAY 
PY  - 2004///
CY  - New York
PB  - Wiley VCH
KW  -  nayfeh ali h
KW  - perturbation
ER  -