GOLDSTEIN, S.; PASZKIEWICZ, A. Comparision of states and Darboux-type properties in von Neumann algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 63, p. 220–232, 1988. DOI: 10.7146/math.scand.a-12236. Disponível em: https://www.mscand.dk/article/view/12236. Acesso em: 30 apr. 2024.