SHAPTALA, V. P. Groups with the minimality condition for infinitely generated subgroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 9, p. 1280–1282, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5647. Acesso em: 5 dec. 2025.