COURTNEY, K. E. Universal $C^∗$-algebras with the local lifting property. MATHEMATICA SCANDINAVICA, [S. l.], v. 127, n. 2, p. 361–381, 2021. DOI: 10.7146/math.scand.a-126018. Disponível em: https://www.mscand.dk/article/view/126018. Acesso em: 22 sep. 2021.