TY  - BOOK
AU  - Sanders, JA
AU  - Verhulst, F
TI  - Averaging methods in nonlinear dynamical systems
SN  - 9780387489162
U1  - 517.928 
PY  - 2007///
CY  - New York
PB  - Springer
KW  - FORMAL THEORY
KW  - LIE THEORY OF MATRICES
KW  - NON-LINEAR OSCILLATOR
N1  - vol.59.
ER  -