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Communicated by N. R. Reilly
The author wishes to take this opportunity to express his appreciation to the referee for some valuable comments which helped to improved the presentation of this paper.
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Huisheng, P. Equivalences, α-semigroups and α-congruences. Semigroup Forum 49, 49–58 (1994). https://doi.org/10.1007/BF02573470
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DOI: https://doi.org/10.1007/BF02573470