ON THE SEMIGROUP OF DIFUNCTIONAL BINARY RELATIONS. FUDMA JOURNAL OF SCIENCES, [S. l.], v. 6, n. 4, p. 17–19, 2022. DOI: 10.33003/fjs-2022-0604-1026. Disponível em: https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1026. Acesso em: 8 sep. 2025.