%0 Journal Article
%A Alberto Baider
%A Richard Churchill
%T Unique Normal Forms for Planar Vector Fields.
%J Mathematische Zeitschrift
%D 1988
%P 303-310
%V 199
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1988__199_1_173968/
%F MZ_1988__199_1_173968