JENSEN, Helge Elbrond. Scattered $C^*$-algebras II. Mathematica Scandinavica, Berkeley, CA, United States, v. 43, p. 308–310, 1978. DOI: 10.7146/math.scand.a-11782. Disponível em: https://journals.msp.org/mscand/article/view/1863. Acesso em: 25 jul. 2026.