TEAM, S. Natural Partial Orders on the Semigroup of Binary Relations: C. Namnak, P. Preechasilp. Thai Journal of Mathematics, [S. l.], v. 4, n. 3, p. 39–50, 2006. Disponível em: https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/67. Acesso em: 14 may. 2024.