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This research was supported in part by grants from the Humboldt Foundation and the U.S. National Science Foundation.
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Gehring, F.W., Pommerenke, C. On the Nehari univalence criterion and quasicircles. Commentarii Mathematici Helvetici 59, 226–242 (1984). https://doi.org/10.1007/BF02566347
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DOI: https://doi.org/10.1007/BF02566347