NIELSEN, Karen Egede. Homomorphisms into simple limits of circle algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 84, n. 1, p. 93–118, 1999. DOI: 10.7146/math.scand.a-13936. Disponível em: https://journals.msp.org/mscand/article/view/960. Acesso em: 25 jul. 2026.