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Krasnodar. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 29, No. 3, pp. 163–174, May–June, 1988.
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Sheretov, V.G. Quasiconformal extremals of smooth functionals and of the energy integral on Riemann surfaces. Sib Math J 29, 467–476 (1988). https://doi.org/10.1007/BF00969658
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DOI: https://doi.org/10.1007/BF00969658