Author: Koppitz, Jörg
- : On semigroups of order-preserving transformations with the same fix set. (English). Czechoslovak Mathematical Journal, vol. 76 (2026), issue 2, pp. 379-399
- : Closure operators and generating sets. (English). Mathematica Slovaca, vol. 51 (2001), issue 3, pp. 259-268
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