1. Conformal Invariants;Ahlfors,1973
2. Harmonic Function Theory;Axler,1992
3. Two-dimensional Geometric Variational Problems;Jost,1991
4. D. Kalaj, Harmonic and quasiconformal functions between convex domains, Doctoral thesis, Beograd, 2002
5. Quasiconformal Mappings in the Plane;Lehto,1973