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This work was supported by the National Science Foundation, research grants NSF-G 1979, NSF-G 5226.
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Kemperman, J.H.B. On small sumsets in an abelian group. Acta Math. 103, 63–88 (1960). https://doi.org/10.1007/BF02546525
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DOI: https://doi.org/10.1007/BF02546525