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Part of this research was done while the author was visiting The University of Texas at Austin in 1984–85.
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Näkki, R., Palka, B. Extremal length and Hölder continuity of conformal mappings. Commentarii Mathematici Helvetici 61, 389–414 (1986). https://doi.org/10.1007/BF02621924
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DOI: https://doi.org/10.1007/BF02621924