%0 Journal Article
%A Louis Block
%A John Franke
%T Existence of Periodic Points of Maps of S1.
%J Inventiones mathematicae
%D 1973
%P 69-74
%V 22
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1973__22_142241/
%F IM_1973__22_142241