NIELSEN, K. E. Homomorphisms into simple limits of circle algebras. MATHEMATICA SCANDINAVICA, [S. l.], v. 84, n. 1, p. 93–118, 1999. DOI: 10.7146/math.scand.a-13936. Disponível em: https://www.mscand.dk/article/view/13936. Acesso em: 5 may. 2024.