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partially supported by NSF grant #DMS-8919696
partially supported by NSF grant #DMS-9103263
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Ash, A., Ginzburg, D. & Rallis, S. Vanishing periods of cusp forms over modular symbols. Math. Ann. 296, 709–723 (1993). https://doi.org/10.1007/BF01445131
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DOI: https://doi.org/10.1007/BF01445131