@Misc{ 
  Pag19,
  author = { Pagliari, Valerio },
  title = { Halfspaces minimise nonlocal perimeter: a proof via calibrations },
  journal = { Annali di Matematica Pura ed Applicata },
  year = { 2019 },
  doi = { https://doi.org/10.1007/s10231-019-00937-7 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4292/ },
  note = { cvgmt preprint}
}