CHERNIKOV, N. S. A Note on FC-Groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 55, n. 2, p. 288–289, 2003. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3907. Acesso em: 14 apr. 2025.