VELLING, J. A. Degeneration of quasicircles: inner and outer radii of Teichmüller spaces. Annales Fennici Mathematici, [S. l.], v. 18, n. 1, p. 147–154, 1993. Disponível em: https://afm.journal.fi/article/view/134777. Acesso em: 14 apr. 2025.