Improved LP-Rounding Approximation Algorithm for k-level Uncapacitated Facility Location. Byrka, J. & Rybicki, B. In Proceedings of International Colloquium on Automata, Languages and Programming (ICALP), pages 157-169, 2012.
Improved LP-Rounding Approximation Algorithm for k-level Uncapacitated Facility Location [link]Paper  bibtex   
@inproceedings{ dblp2464680,
  title = {Improved LP-Rounding Approximation Algorithm for k-level Uncapacitated Facility Location},
  author = {Jaroslaw Byrka and Bartosz Rybicki},
  author_short = {Byrka, J. and Rybicki, B.},
  bibtype = {inproceedings},
  type = {inproceedings},
  year = {2012},
  key = {dblp2464680},
  id = {dblp2464680},
  biburl = {http://www.dblp.org/rec/bibtex/conf/icalp/ByrkaR12},
  url = {http://dx.doi.org/10.1007/978-3-642-31594-7_14},
  conference = {ICALP},
  pages = {157-169},
  text = {ICALP 2012:157-169},
  booktitle = {Proceedings of International Colloquium on Automata, Languages and Programming (ICALP)}
}

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