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@article{MZ_1985__190_173643, author = {D.W. Lewis}, title = {Sums of {Squares} in {Central} {Simple} {Algebras.}}, journal = {Mathematische Zeitschrift}, pages = {497--498}, publisher = {mathdoc}, volume = {190}, year = {1985}, zbl = {0563.16010}, url = {http://geodesic.mathdoc.fr/item/MZ_1985__190_173643/} }
D.W. Lewis. Sums of Squares in Central Simple Algebras.. Mathematische Zeitschrift, Tome 190 (1985), pp. 497-498. http://geodesic.mathdoc.fr/item/MZ_1985__190_173643/