1. L.V. Ahlfors, Conformal Invariants. Topics in Geometric Function Theory (McGraw-Hill Book Co., New York, 1973)
2. E.G. Akhmedzyanova, V.N. Dubinin, Radial transformations of sets, and inequalities for the transfinite diameter. Russ. Math. (Izvestiya VUZ. Matematika) 43(4), 1–6 (1999)
3. T. Bagby, The modulus of a plane condenser. J. Math. Mech. 17(4), 315–329 (1967)
4. A.K. Bakhtin, I.Y. Dvorak, I.V. Denega, A separating transformation in the problems of extremal decomposition of the complex plane. Dop. NAS Ukraine (12), 7–12 (2015) [in Russian]
5. V.N. Dubinin, The separating transformation of domains and problems on the extremal partition. Analytical theory of numbers and theory of functions. Part 9. Zap. Nauchn. Sem. LOMI 168, 48–66 (1988) [in Russian]