PANASYUK, S. P. Normality in the space of subgroups of the Lie group . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 42, n. 6, p. 786–788, 1990. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8837. Acesso em: 6 dec. 2025.