1. [AB50]L. V. Ahlfors—A. Beurling,Conformal invariants and function theoretic null sets, Acta Math.,83 (1950), pp. 101–129.
2. [Ahl66]L. V. Ahlfors,Lectures on quasiconformal mappings, Van Nostrand (Princeton) (1996).
3. [Ast94]K. Astala,Area distortion and quasiconformal mappings, Acta Math.,173 (1994), pp. 37–60.
4. [BI83]B. Bojarski—T. Iwaniec, Analytical foundations of the theory of quasiconformal mappings in ℝ n , Ann. Acad. Sci. Fenn., Ser. A.I.,8 (1983), pp. 257–324.
5. [Boj55]B. V. Bojarski,Homeomorphic solutions of Beltrami systems, Dokl. Akad. Nauk. SSSR,102 (1955), pp. 661–664.