POLOVITSKII, Ya. D.; CHERNIKOV, N. S.; CHECHULIN, V. L. Groups with incidence condition for noncyclic subgroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 4, p. 533–539, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5316. Acesso em: 5 dec. 2025.