Categorification of the Catalan monoid

@article{Grensing2012CategorificationOT,
  title={Categorification of the Catalan monoid},
  author={Anna-Louise Grensing and Volodymyr Mazorchuk},
  journal={Semigroup Forum},
  year={2012},
  volume={89},
  pages={155-168}
}
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