TY  - BOOK
AU  - Simmonds, James G.
AU  - Mann, James E.
TI  - First Look at Perturbation Theory
SN  - 9780486675510
U1  - 515.35 
PY  - 1997///
CY  - New York
PB  - Dover Publication
KW  - Perturbation (Mathematics)
ER  -