GUO, W.; SKIBA, A. N.; SHUM, K. P. $X$-permutable maximal subgroups of Sylow subgroups of finite groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 10, p. 1299–1309, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3533. Acesso em: 6 dec. 2025.