Mishchenko В. I. Local stepwise groups with complementable infinite nonprimary subgroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 6, p. 839–842, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8019. Acesso em: 14 apr. 2025.