ISBELL, John R. Atomless Parts of Spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 31, p. 5–32, 1972. DOI: 10.7146/math.scand.a-11409. Disponível em: https://journals.msp.org/mscand/article/view/2235. Acesso em: 25 jul. 2026.