@article{423933,
      recid = {423933},
      author = {Noumba Um, Paul.},
      title = {A model for calculating interconnection costs in  telecommunications/},
      publisher = {World Bank,},
      address = {Washington, DC :},
      pages = {x, 81 p.},
      year = {2004},
      url = {http://library.usi.edu/record/423933},
}