LIN, H. The simplicity of the quotient algebra $M(A)/A$ of a simple $C^*$-algebra. MATHEMATICA SCANDINAVICA, [S. l.], v. 65, p. 119–128, 1989. DOI: 10.7146/math.scand.a-12270. Disponível em: https://www.mscand.dk/article/view/12270. Acesso em: 7 may. 2024.