PETERSEN, Nils H. Invariant Weights on Semi-Finite von Neumann Algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 32, p. 133–144, 1973. DOI: 10.7146/math.scand.a-11450. Disponível em: https://journals.msp.org/mscand/article/view/2154. Acesso em: 25 jul. 2026.