%0 Journal Article
%A Walter Benz
%A Hubert Berens
%T A contribution to a theorem of Ulam and Mazur.
%J Aequationes mathematicae
%D 1987
%P 61-63
%V 34
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1987__34_137222/
%F AM2_1987__34_137222