@Misc{ 
  FusZha16,
  author = { Fusco, Nicola and Zhang, Yi Ru-Ya },
  title = { A quantitative form of the Faber-Krahn inequality },
  journal = {  },
  year = { 2016 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3015/ },
  note = { cvgmt preprint}
}