Endomorphisms of Clifford semigroups with injective structure homomorphisms von Worawiset, S., Koppitz, J.

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On mappings of terms determined by hypersubstitutions von Koppitz, J., Shtrakov, S.

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Endomorphisms of Clifford semigroups with injective structure homomorphisms von Worawiset, S., Koppitz, J.

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Representations of ordered doppelsemigroups by binary relations von Zhuchok, Y.V., Koppitz, J.

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