@Misc{ 
  MaiMugVec22,
  author = { Maione, Alberto and Mugnai, Dimitri and Vecchi, Eugenio },
  title = { Variational methods for nonpositive mixed local-nonlocal operators },
  journal = {  },
  year = { 2022 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5673/ },
  note = { cvgmt preprint}
}