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Communicated by B. M. Schein
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Mogiljanskaja, E.M. Non-isomorphic semigroups with isomorphic semigroups of subsets. Semigroup Forum 6, 330–333 (1973). https://doi.org/10.1007/BF02389140
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DOI: https://doi.org/10.1007/BF02389140