The maximal subsemigroups of the ideals in a monoid of partial injections von Sareeto, Apatsara, Koppitz, Jörg

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The rank of the inverse semigroup of all partial automorphisms on a finite crown von Dimitrova, Ilinka, Koppitz, Jörg

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A PRESENTATION FOR A SUBMONOID OF THE SYMMETRIC INVERSE MONOID von Sareeto, Apatsara, Koppitz, Jörg

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Presentations for three remarkable submonoids of the dihedral inverse monoid on a finite set von Dimitrova, Ilinka, Fernandes, Vítor H., Koppitz, Jörg, Quinteiro, Teresa M.

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Generating sets of an infinite semigroup of transformations preserving a zig-zag order von LOHAPAN, Laddawan, KOPPITZ, Jörg, WORAWISET, Somnuek

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Free weakly k-nilpotent n-tuple semigroups von ZHUCHOK, ANATOLII V., KOPPITZ, JORG

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The maximal subsemigroups of semigroups of transformations preserving or reversing the orientation on a finite chain von DIMITROVA, ILINKA, FERNANDES, VITOR H., KOPPITZ, JORG

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A note on finite generated subsemigroups of T(X,Y) von Lekkoksung, Nareupanat, Koppitz, Jorg

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Ranks and presentations for order-preserving transformations with one fixed point von KOPPITZ, JOERG, WORAWISET, SOMNUEK

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Separation of On from its proper subsemigroups by a single identity von Koppitz, Jörg

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Separation of $$O_{n}$$ O n from its proper subsemigroups by a single identity von Koppitz, Jörg

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Regular semigroups of partial transformations preserving a fence N von Lohapan, Laddawan, Koppitz, Jörg

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The Rank of the Semigroup of All Order-Preserving Transformations on a Finite Fence von Fernandes, Vítor H., Koppitz, Jörg, Musunthia, Tiwadee

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M-Solid Varieties of Algebras von Koppitz, J, Denecke, K

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Stable varieties of semigroups and groupoids von Shtrakov, Slavcho, Koppitz, Jörg

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Maximal subsemigroups containing a particular semigroup von Koppitz, Jörg, Musunthia, Tiwadee

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The maximal subsemigroups of the ideals on a monoid of partial injections von Sareeto, Apatsara, Koppitz, Jörg

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A presentation for a submonoid of the symmetric inverse monoid von Sareeto, Apatsara, Koppitz, Jörg

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Finite Symmetric Functions with Non-Trivial Arity Gap von Shtrakov, Slavcho, Koppitz, Jörg

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On the maximal regular subsemigroups of ideals of order-preserving or order-reversing transformations von Dimitrova, Ilinka, Koppitz, Jörg

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