VÄISÄLÄ, J. Bilipschitz and quasisymmetric extension properties. Annales Fennici Mathematici, [S. l.], v. 11, n. 2, p. 239–274, 1986. DOI: 10.5186/aasfm.1986.1117. Disponível em: https://afm.journal.fi/article/view/134575. Acesso em: 14 apr. 2025.