FERNSTRÖM, Claes. On the instability of Hausdorff content. MATHEMATICA SCANDINAVICA, [S. l.], v. 60, p. 19–30, 1987. DOI: 10.7146/math.scand.a-12168. Disponível em: https://tidsskrift.dk/math/article/view/12168. Acesso em: 14 aug. 2026.