@Misc{ 
  ButCasMae19,
  author = { Buttazzo, Giuseppe and Casado-Diaz, Juan and Maestre, Faustino },
  title = { On the existence of optimal potentials on unbounded domains },
  journal = {  },
  year = { 2019 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4459/ },
  note = { cvgmt preprint}
}