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 June 3, 2023. https://didacticammath.up.krakow.pl/article/view/9167.