DOVZHENKO, S. A.; CHERNIKOV, N. S. Primary graded groups with complementable non-Frattini subgroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 10, p. 1324–1333, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4731. Acesso em: 5 dec. 2025.