LORING, Terry A. $C^*$-Algebra relations. Mathematica Scandinavica, Berkeley, CA, United States, v. 107, n. 1, p. 43–72, 2010. DOI: 10.7146/math.scand.a-15142. Disponível em: https://journals.msp.org/mscand/article/view/555. Acesso em: 24 jul. 2026.