TY  - BOOK
AU  - Bellman, Richard
TI  - Perturbation techniques in mathematics, engineering and physics
SN  - 9780486432588
U1  - 515.392 B417p 
PY  - 1966///
CY  - Mineola
PB  - Dover Publications, Inc.
KW  - Perturbation (Mathematics)
ER  -