SUND, T. On the structure of solvable Lie algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 44, p. 235–242, 1979. DOI: 10.7146/math.scand.a-11808. Disponível em: https://journals.msp.org/mscand/article/view/1840. Acesso em: 25 jul. 2026.