@Misc{ 
  farval11,
  author = { Farina, Alberto and Valdinoci, Enrico },
  title = { Some results on minimizers and stable solutions of a variational problem },
  journal = { Ergodic Theory and Dynamical Systems },
  year = { 2011 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/482/ },
  note = { cvgmt preprint}
}