LORING, T. A. Projective $C^*$-algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 73, p. 274–280, 1993. DOI: 10.7146/math.scand.a-12471. Disponível em: https://www.mscand.dk/article/view/12471. Acesso em: 2 may. 2024.