GEHRING, F. W. A remark on domains quasiconformally equivalent to a ball. Annales Fennici Mathematici, [S. l.], v. 2, n. 1, p. 147–155, 1976. DOI: 10.5186/aasfm.1976.0212. Disponível em: https://afm.journal.fi/article/view/134290. Acesso em: 25 nov. 2024.