ARCHBOLD, R. J.; SOMERSET, W. B. Transition probabilities and trace functions for $C^*$-algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 73, p. 81–111, 1993. DOI: 10.7146/math.scand.a-12458. Disponível em: https://journals.msp.org/mscand/article/view/1210. Acesso em: 24 jul. 2026.