1. Bers, L., Greenberg, L., Isomorphisms between Teichmüller spaces, Ann. Math. Stud., 1970, 66: 53–79.
2. Earle, C. J., Kra, I., On holomorphic mappings between Teichmüller spaces, In Contributions to Analysis, a Collection of Papers Dedicated to Lipman Bers, (eds. Ahlfors, L. V., Kra, I., Maskit, B. et al.), New York: Academic Press, 1974, 107–124.
3. Earle, C. J., McMullen, C. T., Quasiconformal isotopies, in Holomorphic Functions and Moduli (eds. Drasin, D., Earle, C. J., Gehring, F. W. et al.), Vol. I, Berlin: Springer-Verlag, 1988, 143–154.
4. Gardiner, F. P., A theorem of Bers and Greenberg for infinite dimensional Teichmüller spaces, in Holomorphic Functions and Moduli (eds. Drasin, D., Earle, C. J., Gehring, F. W. et al.), Vol. I, Berlin: Springer-Verlag, 1988, 195–205.
5. Marden, A., On homotopic mappings of Riemann surfaces, Ann. Math., 1969, 90: 1–8.