TY  - BOOK
AU  - Dumortier,Freddy
TI  - Bifurcations of planar vector fields: nilpotent singularities and Abelian integrals 
T2  - Lecture notes in mathematics
SN  - 3540545212
PY  - 1991///
CY  - Berlin , New York 
PB  - Springer-Verlag
KW  - Bifurcation theory
KW  - Differential equations
KW  - Stability
N1  - "Subseries: Instituto de Mathemática [i.e. Matemática] Pura e Aplicada, Rio de Janeiro, Brazil (vol. 48)"--Ser. t.p; Includes bibliographical references and index
ER  -