MEL'NIK, T. I. Varieties of Groups with Invariant Centralizers of Subgroups. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 54, n. 4, p. 483–491, 2002. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4086. Acesso em: 5 dec. 2025.