TUTOV , A. A.; FUTORNY , V. M. On decompositions of the systems of roots of Кас-Moody algebras of rank 2 . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 12, p. 1712–1715, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8196. Acesso em: 5 dec. 2025.