TUSHEV, A. V. On Solvable Groups with Proper Quotient Groups of Finite Rank. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 11, p. 1560–1568, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4192. Acesso em: 7 apr. 2025.