@Misc{ 
  Pis20,
  author = { Piscitelli, Gianpaolo },
  title = { A nonlocal anisotropic eigenvalue problem },
  journal = {  },
  year = { 2020 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5699/ },
  note = { cvgmt preprint}
}