LIMAN, F. N.; LUKASHOVA, T. D. On the norm of decomposable subgroups in nonperiodic groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 67, n. 12, p. 1679–1689, 2015. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2100. Acesso em: 5 dec. 2025.