TY  - BOOK
AU  - Bellman,Richard
TI  - Perturbation techniques in mathematics, physics and engineering
U1  - 517.8 BEL 
PY  - 1964///.
CY  - New York : 
PB  - Holt, Rinehart and Winston, 
KW  - Perturbation techniques
KW  - Renormalization techniques
ER  -