Tutov , A.A. and Futorny , V.M. (1992) “On decompositions of the systems of roots of Кас-Moody algebras of rank 2 ”, Ukrains’kyi Matematychnyi Zhurnal, 44(12), pp. 1712–1715. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/8196 (Accessed: 5 December 2025).