DE, Mari F. Groups with Few Nonmodular Subgroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 10, p. 1419–1423, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3854. Acesso em: 6 dec. 2025.