1. L. V. Ahlfors,Conformal Invariants, McGraw-Hill, New York, 1973.
2. L. V. Ahlfors,Complex Analysis, McGraw-Hill, New York, 1979.
3. L. V. Ahlfors,Lectures on Quasiconformal Mappings, Wadsworth and Brooks/Cole, Monterey, California, 1987.
4. K. Astala and M. Zinsmeister,Teichmüller spaces and BMOA, Math. Ann.289 (1991), 613–625.
5. A. Baernstein II,Ahlfors and conformal invariants, Ann. Acad. Sci. Fenn13 (1989), 289–312.