ASLAKSEN, H.; WAHL, T. Root multiplicities and ideals in quasisimple Lie algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 73, p. 15–20, 1993. DOI: 10.7146/math.scand.a-12452. Disponível em: https://www.mscand.dk/article/view/12452. Acesso em: 8 may. 2024.