TY  - BOOK
AU  - Guckenheimer,John
TI  - Nonlinear oscillations,dynamical systems,and bifurcations of vector fields
SN  - 0387908196
U1  - 510 GUC 
PY  - 1991///
CY  - New York
PB  - Springer
N1  - Includes bibliographical references
ER  -