TY  - JOUR
AU  - M. Marshall
AU  - L. Walter
TI  - Signatures of Higher Level on Rings with Many Units.
JO  - Mathematische Zeitschrift
PY  - 1990
SP  - 129
EP  - 144
VL  - 204
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1990__204_3_183760/
ID  - MZ_1990__204_3_183760
ER  -