KIIKKA, M. Diffeomorphic approximation of quasiconformal and quasisymmetric homeomorphisms. Annales Fennici Mathematici, [S. l.], v. 8, n. 2, p. 251–256, 1983. DOI: 10.5186/aasfm.1983.0814. Disponível em: https://afm.journal.fi/article/view/134471. Acesso em: 25 nov. 2024.