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@article{MZ_1992__209_2_251867, author = {Louis Mah\'e}, title = {Level and {Pythagoras} number of some geometric rings {(Erratum).}}, journal = {Mathematische Zeitschrift}, pages = {481--484}, publisher = {mathdoc}, volume = {209}, number = {2}, year = {1992}, zbl = {0773.11025}, url = {http://geodesic.mathdoc.fr/item/MZ_1992__209_2_251867/} }
Louis Mahé. Level and Pythagoras number of some geometric rings (Erratum).. Mathematische Zeitschrift, Tome 209 (1992) no. 2, pp. 481-484. http://geodesic.mathdoc.fr/item/MZ_1992__209_2_251867/