@Article{
  lusvit05,
  author = { Luca Lussardi and Enrico Vitali },
  title = { Non-local approximation of free-discontinuity functionals with linear growth: the one-dimensional case },
  journal = { Ann. Mat. Pura Appl.  },
  year = { 2007 },
  volume = { 186 },
  number = { 4 },
  pages = { 721-744 },
}