@Article{ 
  mormor01,
  author = { Mora, Maria Giovanna and Morini, Massimiliano },
  title = { Local calibrations for minimizers of the Mumford-Shah functional  with a regular discontinuity set },
  journal = { Ann. Inst. H. Poincaré Anal. Nonlin. },
  year = { 2001 },
  volume = { 18 },
  pages = { 403-436 },
  URL = { http://cvgmt.sns.it/paper/1051/ },
  note = { cvgmt preprint}
}