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Communicated by M. W. Mislove
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El-Mabhouh, A., Pym, J. & Strauss, D. On the two natural products in a Stone-Čech compactification. Semigroup Forum 48, 255–257 (1994). https://doi.org/10.1007/BF02573674
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DOI: https://doi.org/10.1007/BF02573674