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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On relative ranks of finite transformation semigroups with restricted range von Dimitrova, I., Koppitz, J., I., Dimitrova, I., Koppitz, J.

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Free products of $n$-tuple semigroups von Zhuchok, A. V., Koppitz, J., Жучок, А. В., Коппіц, Й.

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