LEHTINEN, M. A real-analytic quasiconformal extension of a quasisymmetric function. Annales Fennici Mathematici, [S. l.], v. 3, n. 2, p. 207–213, 1976. DOI: 10.5186/aasfm.1977.0313. Disponível em: https://afm.journal.fi/article/view/134317. Acesso em: 25 nov. 2024.