TY  - JOUR
AU  - Louis Mahé
TI  - Level and Pythagoras Number of Some Geometric Rings.
JO  - Mathematische Zeitschrift
PY  - 1990
SP  - 615
EP  - 629
VL  - 204
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1990__204_3_183793/
ID  - MZ_1990__204_3_183793
ER  -