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Dormán Miklós; Makay Géza; Maróti Miklós; Vajda Róbert: Monoidal intervals on three- and four-element sets. In: Acta scientiarum mathematicarum, (81) 3-4. pp. 399-424. (2015)
Dormán Miklós: Intervals of collapsing monoids. In: Acta scientiarum mathematicarum, (68) 3-4. pp. 561-569. (2002)