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Communicated by M. Petrich
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Tamura, T. Basic study of\(\mathfrak{N}\)-semigroups and their homomorphisms II-semigroups and their homomorphisms II. Semigroup Forum 10, 250–261 (1975). https://doi.org/10.1007/BF02194892
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DOI: https://doi.org/10.1007/BF02194892