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Research supported in part by the National Science Foundation Grant No. MCS8024276 and by the Sloan Fellowship.
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Dodziuk, J. Every covering of a compact Riemann surface of genus greater than one carries a nontrivialL 2 harmonic differential. Acta Math 152, 49–56 (1984). https://doi.org/10.1007/BF02392190
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DOI: https://doi.org/10.1007/BF02392190