Gorodnik О. V. On the product of an abelian group and a nilpotent group. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 9, p. 1165–1171, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4712. Acesso em: 6 dec. 2025.