@Misc{ 
  FeNoOgSi23,
  author = { Felli, Veronica and Noris, Benedetta and Ognibene, Roberto and Siclari, Giovanni },
  title = { Quantitative spectral stability for Aharonov-Bohm operators with many
  coalescing poles },
  journal = {  },
  year = { 2023 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6076/ },
  note = { cvgmt preprint}
}