1. B. V. Shabat, Introduction to Complex Analysis [in Russian], Vol. 2, Nauka, Moscow (1985).
2. A.V. Sychev, Moduli and Spatial Quasiconformal Mappings [in Russian], Nauka, Novosibirsk (1983).
3. S. Axler, P. Bourdon, and W. Ramey, Harmonic Function Theory, Springer, New York (1992).
4. A. I. Markushevich, Selected Chapters of the Theory of Analytic Functions [in Russian], Nauka, Moscow (1976).
5. Yu. Yu. Trokhimchuk, Continuous Mappings and Conditions of Monogeneity [in Russian], Fizmatgiz, Moscow (1963).