@Misc{ 
  brapia11,
  author = { Braides, Andrea and Piatnitski, Andrey },
  title = { Variational problems with percolation: dilute spin systems at zero temperature (the 2-dimensional case) },
  journal = {  },
  year = { 2011 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/855/ },
  note = { cvgmt preprint}
}