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Communicated by J. M. Howie
The author thanks Professor J. M. Howie for his comments and support.
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Nagy, A. On the structure of (m, n)-commutative semigroups. Semigroup Forum 45, 183–190 (1992). https://doi.org/10.1007/BF03025759
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DOI: https://doi.org/10.1007/BF03025759