ONISHCHUK, V. A. Groups satisfying the condition of weak minimality for subgroups of derived length two. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 9, p. 1203–1207, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5636. Acesso em: 5 dec. 2025.