LI, C.; YI, X.; ZHANG, Xirong. A note on $SΦ$-supplemented subgroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 68, n. 8, p. 1139–1141, 2016. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1908. Acesso em: 5 dec. 2025.