EILERS, Søren. Connectivity and components for $C^*$-algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 84, n. 1, p. 119–136, 1999. DOI: 10.7146/math.scand.a-13937. Disponível em: https://journals.msp.org/mscand/article/view/959. Acesso em: 25 jul. 2026.