CONNES, A.; DAELE, A. V. The Group Property of the Invariant $S$ of von Neumann Algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 32, p. 187–192, 1973. DOI: 10.7146/math.scand.a-11454. Disponível em: https://www.mscand.dk/article/view/11454. Acesso em: 4 may. 2024.