%0 Journal Article
%A Christian C. Fenske
%T An index for periodic orbits of functional differential equations.
%J Mathematische Annalen
%D 1989
%P 381-392
%V 285
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1989__285_1_164607/
%F MAN_1989__285_1_164607