@Article{ 
  belnovpao07,
  author = { Bellettini, Giovanni and Novaga, Matteo and Paolini, Maurizio and Tornese, Calogero },
  title = { Classification of the equilibria for the semi-discrete Perona-Malik equation },
  journal = { Calcolo },
  year = { 2009 },
  volume = { 46 },
  number = { 4 },
  pages = { 221-243 },
  URL = { http://cvgmt.sns.it/paper/1377/ },
  note = { cvgmt preprint}
}