Tutov AA, Futorny VM. On decompositions of the systems of roots of Кас-Moody algebras of rank 2 . Ukr. Mat. Zhurn. [Internet]. 1992Dec.4 [cited 2024Jul.27];44(12):1712-5. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/8196