TUKIA, P.; VÄISÄLÄ, J. Lipschitz and quasiconformal approximation and extension. Annales Fennici Mathematici, [S. l.], v. 6, n. 2, p. 303–342, 1981. DOI: 10.5186/aasfm.1981.0626. Disponível em: https://afm.journal.fi/article/view/134419. Acesso em: 5 may. 2024.