GILLETTE, R. M.; TAYLOR, D. C. The minimal dense two-sided ideal of a $C^*$-algebra with continous trace. Mathematica Scandinavica, Berkeley, CA, United States, v. 44, p. 201–206, 1979. DOI: 10.7146/math.scand.a-11803. Disponível em: https://journals.msp.org/mscand/article/view/1844. Acesso em: 25 jul. 2026.