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Krokhin Andrei A.; Larose Benoit: A monoidal interval of isotone clones on a finite chain. In: Acta scientiarum mathematicarum, (68) 1-2. pp. 37-62. (2002)
Krokhin Andrei A.; Schweigert Dietmar: On clones preserving a reflexive binary relation. In: Acta scientiarum mathematicarum, (67) 3-4. pp. 461-473. (2001)