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Based upon work supported by the National Science Foundation under Grant DMS-9401816.
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Gesztesy, F., Weikard, R. Picard potentials and Hill's equation on a torus. Acta Math. 176, 73–107 (1996). https://doi.org/10.1007/BF02547336
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DOI: https://doi.org/10.1007/BF02547336