@Misc{ 
  MaiPioSte14a,
  author = { Mainini, Edoardo and Piovano, Paolo and Stefanelli, Ulisse },
  title = { Crystalline and isoperimetric square configurations },
  journal = {  },
  year = { 2014 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3149/ },
  note = { cvgmt preprint}
}