GILLETTE, R. M.; TAYLOR, D. C. The minimal dense two-sided ideal of a $C^*$-algebra with continous trace. MATHEMATICA SCANDINAVICA, [S. l.], v. 44, p. 201–206, 1979. DOI: 10.7146/math.scand.a-11803. Disponível em: https://www.mscand.dk/article/view/11803. Acesso em: 7 may. 2024.