KURSOV, Valery V. A crossed product of a skew field of quaternions and four-group. Journal of the Belarusian State University. Mathematics and Informatics, [S. l.], n. 2, p. 12–16, 2018. Disponível em: https://journals.bsu.by/index.php/mathematics/article/view/743. Acesso em: 17 jul. 2026.