%0 Journal Article
%A M. Marshall
%A L. Walter
%T Signatures of Higher Level on Rings with Many Units.
%J Mathematische Zeitschrift
%D 1990
%P 129-144
%V 204
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1990__204_3_183760/
%F MZ_1990__204_3_183760