POPOVICH, S. V.; SYSAK, Ya. P. Radical algebras subgroups of whose adjoint groups are subalgebras. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 12, p. 1646–1652, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5169. Acesso em: 14 apr. 2025.