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To Seppo Rickman on his 60th birthday
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Srebro, U., Yakubov, E. Branched folded maps and alternating Beltrami equations. J. Anal. Math. 70, 65–90 (1996). https://doi.org/10.1007/BF02820441
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DOI: https://doi.org/10.1007/BF02820441