%0 Journal Article
%A Wilhelm Magnus
%T Rings of Fricke Characters and Automorphism Groups of Free Groups.
%J Mathematische Zeitschrift
%D 1980
%P 91-104
%V 170
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1980__170_172903/
%F MZ_1980__170_172903