HALPERN, Herbert. Harmonic analysis of Abelian inner automorphism groups of von Neumann algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 50, p. 79–99, 1982. DOI: 10.7146/math.scand.a-11946. Disponível em: https://journals.msp.org/mscand/article/view/1699. Acesso em: 25 jul. 2026.