@Article{ 
  GobPic20,
  author = { Gobbino, Massimo and Picenni, Nicola },
  title = { On the characterization of constant functions through nonlocal  functionals },
  journal = { Commun. Contemp. Math. },
  year = { 2023 },
  doi = { https://doi.org/10.1142/S0219199722500389 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5427/ },
  note = { cvgmt preprint}
}