KURDACHENKO, L. A.; OTAL, J. Groups all proper quotient groups of which have Chernikov conjugacy classes. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 3, p. 346–353, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4424. Acesso em: 7 apr. 2025.