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Communicated by H. J. Hoehnke
The author thanks Professor H. J. Hoehnke for his support
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Nagy, A. RC-commutative Δ-semigroups. Semigroup Forum 44, 332–340 (1992). https://doi.org/10.1007/BF02574352
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DOI: https://doi.org/10.1007/BF02574352