TY  - BOOK
AU  - Bellman,Richard Ernest
TI  - Perturbation techniques in mathematics, physics, and engineering
T2  - Athena series, selected topics in mathematics
AV  - QA871 B4
PY  - 1964///
CY  - New York
PB  - Holt, Rinehart and Winston
KW  - Perturbación (Matemáticas)
ER  -