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Communicated by J. S. Ponizovskii
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Kehayopulu, N., Tsingelis, M. The embedding of an ordered semigroup in a simple one with identity. Semigroup Forum 53, 346–350 (1996). https://doi.org/10.1007/BF02574149
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DOI: https://doi.org/10.1007/BF02574149