@Misc{ 
  Maz14,
  author = { Mazzoleni, Dario },
  title = { Existence and regularity results for solutions of spectral problems },
  journal = {  },
  year = { 2014 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2564/ },
  note = { cvgmt preprint}
}