FERNSTRÖM, Claes. On the instability of Hausdorff content. Mathematica Scandinavica, Berkeley, CA, United States, v. 60, p. 19–30, 1987. DOI: 10.7146/math.scand.a-12168. Disponível em: https://journals.msp.org/mscand/article/view/1462. Acesso em: 25 jul. 2026.