LYMAN, F. N.; LUKASHOVA, T. D. On Infinite Groups with Given Properties of the Norm of Infinite Subgroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 53, n. 5, p. 625–630, 2001. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4285. Acesso em: 5 dec. 2025.