@Misc{ 
  ButDePGor12,
  author = { Buttazzo, Giuseppe and De Pascale, Luigi and Gori-Giorgi, Paola },
  title = { Optimal-transport formulation of electronic density-functional theory },
  journal = { Physical Review A },
  year = { 2012 },
  pages = { 12 },
  URL = { http://cvgmt.sns.it/paper/1845/ },
  note = { cvgmt preprint}
}