BRENNAN, Joseph P.; VASCONCELOS, Wolmer V. On the structure of closed ideals. Mathematica Scandinavica, Berkeley, CA, United States, v. 88, n. 1, p. 3–16, 2001. DOI: 10.7146/math.scand.a-14311. Disponível em: https://journals.msp.org/mscand/article/view/894. Acesso em: 24 jul. 2026.