HØST-MADSEN, Anders. Separable algebras and covering spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 87, n. 2, p. 211–239, 2000. DOI: 10.7146/math.scand.a-14306. Disponível em: https://journals.msp.org/mscand/article/view/899. Acesso em: 24 jul. 2026.