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Communicated by J. M. Howie
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Saitô, T., Aoki, K. & Kajitori, K. Remarks on isomorphisms of regressive transformation semigroups. Semigroup Forum 53, 129–134 (1996). https://doi.org/10.1007/BF02574127
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DOI: https://doi.org/10.1007/BF02574127