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This work was supported in part by grants MCS-75-23332-A03 and MCS-77-01831-A01 from the National Science Foundation. It originated during the Samuel Neiman Research Year at the Technion in Haifa.
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Schiffer, M., Schober, G. A variational method for general families of quasiconformal mappings. J. Anal. Math. 34, 240–264 (1978). https://doi.org/10.1007/BF02790014
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DOI: https://doi.org/10.1007/BF02790014