@Misc{ 
  FelLivOgn26,
  author = { Felli, Veronica and Liverani, Lorenzo and Ognibene, Roberto },
  title = { On the splitting of Neumann eigenvalues in perforated domains },
  journal = {  },
  year = { 2026 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/7528/ },
  note = { cvgmt preprint}
}