%0 Journal Article
%A Louis Mahé
%T Level and Pythagoras Number of Some Geometric Rings.
%J Mathematische Zeitschrift
%D 1990
%P 615-629
%V 204
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1990__204_3_183793/
%F MZ_1990__204_3_183793