LI, Changwen. S-semipermutable and Weakly S-permutable Subgroups. MATEMATIKA, [S. l.], v. 26, p. 127–136, 2010. DOI: 10.11113/matematika.v26.n.556. Disponível em: https://matematika.utm.my/index.php/matematika/article/view/556. Acesso em: 3 may. 2024.