KADISON, R. V.; PEDERSEN, G. K. Equivalence in Operator Algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 27, p. 205–222, 1970. DOI: 10.7146/math.scand.a-10999. Disponível em: https://www.mscand.dk/article/view/10999. Acesso em: 4 may. 2024.