@article{PPN266833020_0204+dmdlog57,
title = {Level and Pythagoras Number of Some Geometric Rings.},
journal = {Mathematische Zeitschrift},
volume = {205},
year = {1990},
pages = {615-629},
zbl = {0773.11024},
url = {http://dml.mathdoc.fr/item/PPN266833020_0204+dmdlog57}
}
Mahé, Louis. Level and Pythagoras Number of Some Geometric Rings.. Mathematische Zeitschrift, Tome 205 (1990) pp. 615-629. http://gdmltest.u-ga.fr/item/PPN266833020_0204+dmdlog57/