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Research supported in part by a grant from the U.S. National Science Foundation, DMS-9007946
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Iwaniec, T., Martin, G. Quasiregular map**s in even dimensions. Acta Math. 170, 29–81 (1993). https://doi.org/10.1007/BF02392454
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DOI: https://doi.org/10.1007/BF02392454