@incollection{litvinchev2012solving,
  title={Solving the two-stage capacitated facility location problem by the lagrangian heuristic},
  author={Litvinchev, Igor and Espinosa, Edith Lucero Ozuna},
  booktitle={Computational Logistics},
  pages={92--103},
  year={2012},
  publisher={Springer Berlin Heidelberg},
  keywords = {pisis}
}

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