SCHREYE, D. De. Integrable, ergodic actions of Abelian groups on von Neumann algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 53, p. 265–280, 1983. DOI: 10.7146/math.scand.a-12034. Disponível em: https://journals.msp.org/mscand/article/view/1635. Acesso em: 25 jul. 2026.