@Article{ 
  MaiMugVec22,
  author = { Maione, Alberto and Mugnai, Dimitri and Vecchi, Eugenio },
  title = { Variational methods for nonpositive mixed local-nonlocal operators },
  journal = { Fractional Calculus and Applied Analysis },
  year = { 2023 },
  doi = { 10.1007/s13540-023-00147-2 },
  volume = { 26 },
  number = { 3 },
  pages = { 943-961 },
  URL = { http://cvgmt.sns.it/paper/5673/ },
  note = { cvgmt preprint}
}