ZHANG, S. Toeplitz algebras and infinite simple $C^*$-algebras associated with reduced group $C^*$-algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 81, p. 86–100, 1997. DOI: 10.7146/math.scand.a-12867. Disponível em: https://www.mscand.dk/article/view/12867. Acesso em: 30 apr. 2024.