UPMEIER, Harald. Derivatons of Jordan $C^*$-algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 46, p. 251–264, 1980. DOI: 10.7146/math.scand.a-11867. Disponível em: https://journals.msp.org/mscand/article/view/1780. Acesso em: 25 jul. 2026.