ASLAKSEN, Helmer; WAHL, Terje. Root multiplicities and ideals in quasisimple Lie algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 73, p. 15–20, 1993. DOI: 10.7146/math.scand.a-12452. Disponível em: https://journals.msp.org/mscand/article/view/1215. Acesso em: 24 jul. 2026.