KADISON, R. V.; PEDERSEN, G. K. Equivalence in Operator Algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 27, p. 205–222, 1970. DOI: 10.7146/math.scand.a-10999. Disponível em: https://journals.msp.org/mscand/article/view/2328. Acesso em: 25 jul. 2026.