BRATTELI, Ola; ROBINSON, Derek W. Positive $C_0$-semigroups on $C^*$-algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 49, p. 259–274, 1981. DOI: 10.7146/math.scand.a-11935. Disponível em: https://journals.msp.org/mscand/article/view/1736. Acesso em: 25 jul. 2026.