KALASHNIKOVA, N. V. Groups all proper quotient groups of which possess layer-Chernikov properties. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 11, p. 1497–1505, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4801. Acesso em: 5 dec. 2025.