C. S., P.; N. S., M.; A. V., J. \(\mathcal{D}\)-squares and \(E\)-squares. Communications in Mathematics and Applications, [S. l.], v. 12, n. 1, p. 213–219, 2021. DOI: 10.26713/cma.v12i1.1456. Disponível em: http://www.rgnpublications.com/journals/index.php/cma/article/view/1456. Acesso em: 3 may. 2024.