GOLDSTEIN, Stanislaw; PASZKIEWICZ, Adam. Comparision of states and Darboux-type properties in von Neumann algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 63, p. 220–232, 1988. DOI: 10.7146/math.scand.a-12236. Disponível em: https://journals.msp.org/mscand/article/view/1427. Acesso em: 25 jul. 2026.