1. M. Abate and G. Patrizio, “Isometries of the Teichmüller metric,” Ann. Scuola Super. Pisa Cl. Sci., 26(4), 437–452 (1988).
2. L. Ahlfors, “An extension of Schwarz’s lemma,” Trans. Amer. Math. Soc., 43, 359–364 (1938).
3. L. Ahlfors, Lectures on Quasiconformal Mappings, Van Nostrand, Princeton, 1966.
4. S. Dineen, The Schwarz Lemma. Clarendon Press, Oxford, 1989.
5. C.J. Earle and J.J. Eells, “On the differential geometry of Teichmüller spaces,” J. Analyse Math., 19, 35–52 (1967).