KALYUZHNYI, A. A. Algebras with nonquadratic relations associated with Bessel hypergroups. Methods of Functional Analysis and Topology, [S. l.], v. 3, n. 4, p. 70–76, 1997. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/50. Acesso em: 19 dec. 2025.