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Part of the research for this paper was done while the first author was visiting at the Mittag-Leffler Institute. He wishes to express his gratitude to the Institute for its hospitality
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Koskela, P., Reitich, F. Hölder continuity of Sobolev functions and quasiconformal mappings. Math. Z. 213, 457–472 (1993). https://doi.org/10.1007/BF03025731
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DOI: https://doi.org/10.1007/BF03025731