@article{PPN266833020_0204+dmdlog13,
title = {Signatures of Higher Level on Rings with Many Units.},
journal = {Mathematische Zeitschrift},
volume = {205},
year = {1990},
pages = {129-144},
zbl = {0676.10016},
url = {http://dml.mathdoc.fr/item/PPN266833020_0204+dmdlog13}
}
Marshall, M.; Walter, L. Signatures of Higher Level on Rings with Many Units.. Mathematische Zeitschrift, Tome 205 (1990) pp. 129-144. http://gdmltest.u-ga.fr/item/PPN266833020_0204+dmdlog13/