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Univalent Σ-harmonic mappings: connections with quasiconformal mappings

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Alessandrini, G., Nesi, V. Univalent Σ-harmonic mappings: connections with quasiconformal mappings. J. Anal. Math. 90, 197–215 (2003). https://doi.org/10.1007/BF02786556

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