@Misc{ 
  Foc12b,
  author = { Focardi, Matteo },
  title = { Regularity issues for local minimizers of the Mumford &  Shah energy in 2d },
  journal = { Bruno Pini Mathematical Analysis Seminar },
  year = { 2012 },
  pages = { 14--32 },
  URL = { http://cvgmt.sns.it/paper/2444/ },
  note = { cvgmt preprint}
}