TANG, P. Regularity and extremality of quasiconformal homeomorphisms on CR 3-manifolds. Annales Fennici Mathematici, [S. l.], v. 21, n. 2, p. 289–308, 1996. Disponível em: https://afm.journal.fi/article/view/134868. Acesso em: 10 apr. 2025.