E. H. HAMOUDA. Soft Characteristic Interior Ideals in Semigroups. International Journal of Mathematics And its Applications, [S. l.], v. 3, n. 3 - B, p. 49–53, 2015. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/456. Acesso em: 2 apr. 2026.