@Misc{ 
  Maz14a,
  author = { Mazzoleni, Dario },
  title = { Recent existence results for spectral problems },
  journal = {  },
  year = { 2014 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2565/ },
  note = { cvgmt preprint}
}