TY  - BOOK
AU  - Bellman,Richard
TI  - Perturbation techniques in mathematics, physics, and engineering
U1  - 510 
PY  - 1964///
CY  - New York, London
PB  - Holt, Rinehart and Winston
KW  - Perturbation (Mathematics)
N1  - Includes bibliographical references
ER  -