Galecka, Aleksandra. “A Proof of the Hurwit’z Theorem About Composition Algebras”. Annales Universitatis Paedagogicae Cracoviensis | Studia ad Didacticam Mathematicae Pertinentia 13 (December 31, 2021): 101–114. Accessed April 26, 2024. https://didacticammath.uken.krakow.pl/article/view/9167.