TY  - BOOK
AU  - Chow, Shui-Nee
AU  - Li, Chengzhi
TI  - Normal forms and bifurcation of planar vector fields
SN  - 9780521372268
U1  - 515.35 
PY  - 1994///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Bifurcation theory
ER  -