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Translated from Sibirskii Matematischeskii Zhurnal, Vol. 8, No. 2, pp. 313–332, March–April, 1967
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Krushkal, S.L. Teichmuller's theorem on extremal quasi-conformal liappings. Soviet Mathematical Journal 8, 231–244 (1967). https://doi.org/10.1007/BF02302474
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DOI: https://doi.org/10.1007/BF02302474