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The authors were partially supported by NSF grant MCS 78-00811.
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Berenstein, C.A., Zalcman, L. Pompeiu's problem on symmetric spaces. Commentarii Mathematici Helvetici 55, 593–621 (1980). https://doi.org/10.1007/BF02566709
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DOI: https://doi.org/10.1007/BF02566709