BEHNCKE, H.; BÖS, W. JB algebras with an exceptional ideal. Mathematica Scandinavica, Berkeley, CA, United States, v. 42, p. 306–312, 1978. DOI: 10.7146/math.scand.a-11755. Disponível em: https://journals.msp.org/mscand/article/view/1892. Acesso em: 25 jul. 2026.