@Article{ 
  lusvit,
  author = { Lussardi, Luca and Vitali, Enrico },
  title = { Non-local approximation of free-discontinuity problems with linear growth },
  journal = { ESAIM Control Optim. Calc. Var. },
  year = { 2007 },
  volume = { 13 },
  number = { 1 },
  pages = { 135 },
  URL = { http://cvgmt.sns.it/paper/615/ },
  note = { cvgmt preprint}
}