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Work supported in part by the U.S. Office of Ordnance Research under Contract DA-23-072-ORD-392.
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Hirschman, I.I. A convexity theorem for certain groups of transformations. J. Anal. Math. 2, 209–218 (1952). https://doi.org/10.1007/BF02825637
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DOI: https://doi.org/10.1007/BF02825637