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Dedicated to Professor C. Loewner on his seventieth birthday
This research was supported by the National Science Foundation, Contract NSF-G-18913 and Contract NSF-GP-1648.
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Gehring, F.W., Väisälä, J. The coefficients of quasiconformality of domains in space. Acta Math. 114, 1–70 (1965). https://doi.org/10.1007/BF02391817
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DOI: https://doi.org/10.1007/BF02391817