A polyhedral study of a two level facility location model

@article{Baou2014APS,
  title={A polyhedral study of a two level facility location model},
  author={Mourad Ba{\"i}ou and Francisco Barahona},
  journal={RAIRO - Operations Research},
  year={2014},
  volume={48},
  pages={153-165}
}
We study an uncapacitated facility location model where customers are served by facilities of level one, then each level one facility that is opened must be assigned to an opened facility of level two. We identify a polynomially solvable case, and study some valid inequalities and facets of the associated polytope. 

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