PETRAVCHUK, A. P.; MAKSIMENKO, D. V.; BILUN, S. V. On the group of Lie-orthogonal operators on a Lie algebra. Methods of Functional Analysis and Topology, [S. l.], v. 17, n. 3, p. 199–203, 2011. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/484. Acesso em: 16 dec. 2025.