ノルム多元体
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↑ Adolf Hurwitz (1898). “Ueber die Composition der quadratischen Formen von beliebig vielen Variabeln (On the composition of quadratic forms of arbitrary many variables)” (German). Nachr. Ges. Wiss. Göttingen: 309-316. JFM 29.0177.01.
↑ Max Zorn (1930). “Theorie der alternativen Ringe”. Abh. Math. Sem. Univ. Hamburg 8: 123-147.
↑ Matthew Badger (2006年). “Division algebras over the real numbers”. 2011年6月7日時点のオリジナルよりアーカイブ。2012年9月27日閲覧。
↑ Kantor, I.L.; Solodovnikov, A.S. (1989). “Normed algebras with an identity. Hurwitz's theorem.”. Hypercomplex numbers. An elementary introduction to algebras. Trans. A. Shenitzer (2nd ed.). Springer-Verlag. p.