Independence of the axioms of hypergroup over the group. Armenian Journal of Mathematics, [S. l.], v. 13, n. 12, p. 1–11, 2021. DOI: 10.52737/18291163-2021.13.12-1-11. Disponível em: http://test.armjmath.sci.am/index.php/ajm/article/view/571. Acesso em: 18 oct. 2024.