1. M. I. Andriichuk, N. N. Voitovich, P. A. Savenko, and V. P. Tkachuk, Synthesis of Antennas by the Amplitude Directivity Pattern. Numerical Methods and Algorithms [in Russian], Naukova Dumka, Kiev (1993).
2. A. V. Bitsadze, Foundations of the Theory of Analytic Functions of Complex Variable [in Russian], Nauka, Moscow (1969).
3. M. M. Vainberg and V. A. Trenogin, Theory of Branching of the Solutions of Nonlinear Equations [in Russian], Nauka, Moscow (1969).
4. É. Goursat, Course of Mathematical Analysis [Russian translation], Vol. 1, Gostekhteorizdat, Moscow (1933).
5. P. P. Zabreiko, A. I. Koshelev, M. A. Krasnosel’skii, et al., Integral Equations [in Russian], Nauka, Moscow (1968).