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An extremal problem in potential theory. (English. Russian original) Zbl 1314.31007
Russ. Math. Surv. 69, No. 5, 915-917 (2014); translation from Usp. Mat. Nauk, Ser. Mat. 69, No. 5, 157-158 (2014).
MSC:
31A99 Two-dimensional potential theory
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