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4. V. Gutlyanskii, V. Ryazanov, U. Srebro, and E. Yakubov, The Beltrami Equation: A Geometric Approach, Springer, Berlin, 2012.
5. V. N. Dubinin, Capacities of Capacitors and Symmetrization in the Geometric Theory of Functions of Complex Variable [in Russian], Dal’nauka, Vladivostok, 2009.