1. [1] W. Abikoff, Degenerating families of Riemann surfaces, Ann. of Math. (2) 105 (1977), no. 1, 29–44.
2. [2] W. Abikoff, The real analytic theory of Teichmüller space, Lecture Notes in Mathematics, vol. 820, Springer, Berlin, 1980.
3. [3] L. Bers, Quasiconformal mappings and Teichmüller's theorem, Analytic functions ed. R. Nevalinna, et al., Princeton Univ. Press, Princeton, N.J., 1960, pp. 89–119.
4. [4] A. Fathi, et al., Travaux de Thurston sur les surfaces, Astérisque, Société mathématique de France, Paris, 1979, 66–67.
5. [5] J. Hubbard and H. Masur, Quadratic differentials and foliations, Acta Math. 142 (1979), no. 3-4, 221–274.