1. M. A. Lavrent’ev and B. V. Shabat, Methods of the Theory of Functions of a Complex Variable (Nauka, Moscow, 1958) [in Russian].
2. G. M. Goluzin, Geometric theory of functions of a complex variable (AMS, Providence, RI, 1969).
3. W. von Koppenfels and F. Stallmann, Praxis der konformen Abbilung (Springer, Berlin-Göttingen- Heidelberg, 1959) [in German].
4. G. Goluzin, L. Kantorovich, V. Krylov, P. Melent’ev, M. Muratov and N. Stenin, Conformal Mapping of Simply Connected and Multiply Connected Domains (Nauka, Leningrad–Moscow, 1937) [in Russian].
5. L. V. Kantorovich and V. I. Krylov, Approximate Methods of Higher Analysis (Interscience Publishers, Inc.; P. Noordhoff Ltd., New York, Groningen, 1958).