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Hollings, Christopher: Simplified conditions for type-I and type-II monoids. Acta scientiarum mathematicarum, (77) 1-2. pp. 63-72. (2011)
Hollings, Christopher: Conditions for the prefix expansion of a monoid to be (weakly) left ample. Acta scientiarum mathematicarum, (73) 3-4. pp. 519-545. (2007)