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This research was supported in part by a grant from the U.S. National Science Foundation.
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Astala, K., Gehring, F.W. Injectivity, the BMO norm and the universal Teichmüller space. J. Anal. Math. 46, 16–57 (1986). https://doi.org/10.1007/BF02796572
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DOI: https://doi.org/10.1007/BF02796572