PETRAVCHUK, A. P. On the sum of two Lie algebras with finite-dimensional commutants. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 8, p. 1089–1096, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5505. Acesso em: 5 dec. 2025.