BRATTELI, O.; ROBINSON, D. W. Positive $C_0$-semigroups on $C^*$-algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 49, p. 259–274, 1981. DOI: 10.7146/math.scand.a-11935. Disponível em: https://www.mscand.dk/article/view/11935. Acesso em: 11 apr. 2025.