@Misc{ 
  ButGuaOli13,
  author = { Buttazzo, Giuseppe and Guarino Lo Bianco, Serena and Oliviero, Fabrizio },
  title = { Optimal location problems with routing cost },
  journal = { Discrete Contin. Dyn. Syst. },
  year = { 2013 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2173/ },
  note = { cvgmt preprint}
}