HE, X.; LI, S.; WANG, Youyu. Groups all cyclic subgroups of which are BN A-subgroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 2, p. 284–288, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1695. Acesso em: 5 dec. 2025.