LORING, Terry A. $C^*$-Algebra relations. MATHEMATICA SCANDINAVICA, [S. l.], v. 107, n. 1, p. 43–72, 2010. DOI: 10.7146/math.scand.a-15142. Disponível em: https://tidsskrift.dk/math/article/view/15142. Acesso em: 14 aug. 2026.