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Work supported by Contract Number DA-30-069-ORD-2153 (Army Research Office).
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Bers, L. The equivalence of two definitions of quasiconformal mappings. Commentarii Mathematici Helvetici 37, 148–154 (1962). https://doi.org/10.1007/BF02566969
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DOI: https://doi.org/10.1007/BF02566969