Popovich, S. V., and Ya. P. Sysak. “Radical Algebras Subgroups of Whose Adjoint Groups Are Subalgebras”. Ukrains’kyi Matematychnyi Zhurnal 49, no. 12 (December 25, 1997): 1646–1652. Accessed April 14, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5169.