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This research was supported in part by NSF GP-28070 and the results of this paper form part of a Ph.D. dissertation to be submitted to the University of Colorado.
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Sanerib, R. Automorphism groups of ultrafilters. Algebra Universalis 4, 141–150 (1974). https://doi.org/10.1007/BF02485718
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DOI: https://doi.org/10.1007/BF02485718