GOVINDARAJAN, S. Hypergroups Associated with Ternary Relations and the Associated Join Space of the Spherical Geometry. European Journal of Pure and Applied Mathematics, [S. l.], v. 9, n. 4, p. 367–382, 2016. Disponível em: https://ejpam.com/index.php/ejpam/article/view/2515. Acesso em: 26 nov. 2022.