PAEPE, P. J. De. Essential function algebras with large Silov boundary. Mathematica Scandinavica, Berkeley, CA, United States, v. 43, p. 325–328, 1978. DOI: 10.7146/math.scand.a-11785. Disponível em: https://journals.msp.org/mscand/article/view/1858. Acesso em: 25 jul. 2026.