GRIBOVSKAYA, E. E.; MONAKHOV, V. S.; SEL’KIN, V. M. On Solvable Normal Subgroups of Finite Groups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 7, p. 950–960, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4131. Acesso em: 7 apr. 2025.