TY  - GEN
AU  - Percival, Ian 
AU  - Richards, Derek 
TI  - Introduction to dynamics
SN  - 9780521281492
U1  - 531 PER/I 
PY  - 1982///
CY  - New York
PB  - Cambridge University Press
KW  - Transformation theory
KW  - Perturbation theory
ER  -