TY  - BOOK
AU  - Chow, Shui-Nee
AU  - Li, Chengzhi
AU  - Wang, Duo
TI  - Normal forms and Bifurcation of planar vector fields
SN  - 0521372267
U1  - 515.35, 
PY  - 1994///
CY  - Cambridge
PB  - Cambridge University Press
ER  -