LEHTO, O.; TAMMI, O. Area method and univalent functions with quasiconformal extensions. Annales Fennici Mathematici, [S. l.], v. 2, n. 1, p. 307–313, 1976. DOI: 10.5186/aasfm.1976.0220. Disponível em: https://afm.journal.fi/article/view/134299. Acesso em: 25 nov. 2024.