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Fait, M., Krzyż, J.G. & Zygmunt, J. Explicit quasiconformal extensions for some classes of univalent functions. Commentarii Mathematici Helvetici 51, 279–285 (1976). https://doi.org/10.1007/BF02568157
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DOI: https://doi.org/10.1007/BF02568157