MONAKHOV, V. S.; KONOVALOVA , M. N. On groups with formational subnormal strictly 2-maximal subgroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 73, n. 1, p. 107–116, 2021. DOI: 10.37863/umzh.v73i1.1115. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1115. Acesso em: 5 dec. 2025.