CHERNIKOV , S. N.; LEVISHCHENKO , S. S. Constructive description of finite nondispersed groups where all subgroups of the nonprimary index are Abelian . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 6, p. 818–822, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8015. Acesso em: 6 dec. 2025.