COURTNEY, Kristin E. Universal $C^∗$-algebras with the local lifting property. Mathematica Scandinavica, Berkeley, CA, United States, v. 127, n. 2, p. 361–381, 2021. DOI: 10.7146/math.scand.a-126018. Disponível em: https://journals.msp.org/mscand/article/view/152. Acesso em: 24 jul. 2026.