HANSEN, Frank. Inner one-parameter groups acting on a factor. Mathematica Scandinavica, Berkeley, CA, United States, v. 41, p. 113–116, 1977. DOI: 10.7146/math.scand.a-11706. Disponível em: https://journals.msp.org/mscand/article/view/1944. Acesso em: 25 jul. 2026.