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The author is supported by the Schweizerischer Nationalfonds zur Förderung der wissenschaftlichen Forschung.
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Fehlmann, R. On the local dilatation of quasisymmetric mappings and a theorem of Kurt Friedrichs. J. Anal. Math. 43, 161–182 (1983). https://doi.org/10.1007/BF02790182
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DOI: https://doi.org/10.1007/BF02790182