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@article{MS2_1974__35_166393, author = {P. Ribenboim}, title = {Pfister's {Dimension} and the {Level} of {Fields.}}, journal = {Mathematica Scandinavica}, pages = {301--308}, publisher = {mathdoc}, volume = {35}, year = {1974}, zbl = {0301.12101}, url = {http://geodesic.mathdoc.fr/item/MS2_1974__35_166393/} }
P. Ribenboim. Pfister's Dimension and the Level of Fields.. Mathematica Scandinavica, Tome 35 (1974), pp. 301-308. http://geodesic.mathdoc.fr/item/MS2_1974__35_166393/