TY  - JOUR
AU  - Alberto Baider
AU  - Richard Churchill
TI  - Unique Normal Forms for Planar Vector Fields.
JO  - Mathematische Zeitschrift
PY  - 1988
SP  - 303
EP  - 310
VL  - 199
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1988__199_1_173968/
ID  - MZ_1988__199_1_173968
ER  -