TY  - BOOK
AU  - Sanders, J. A. and Verhulst, F.
AU  - Verhulst, F. ; jt. auth.
TI  - Averaging methods in nonlinear dynamical systems
T2  - Applied Mathematical Sciences 
U1  - 515.35 
PY  - 1985///
CY  - New York
PB  - Springer-Verlag
ER  -