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3. V. N. Dubinin, Condenser Capacities and Symmetrization in Geometric Function Theory, Birkhäuser, Basel (2014).
4. A. K. Bakhtin, “Separating transformation and extremal problems on nonoverlapping simply connected domains,” J. Math. Sci., 234, No. 1, 1–13 (2018).
5. A. K. Bakhtin, “Extremal decomposition of the complex plane with restrictions for free poles,” J. Math. Sci., 231, No. 1, 1–15 (2018).