@Article{ 
  mor01,
  author = { Mora, Maria Giovanna },
  title = { Local calibrations for minimizers of the Mumford-Shah functional with a triple junction },
  journal = { Communications in Contemporary Mathematics },
  year = { 2002 },
  volume = { 4 },
  number = { 2 },
  pages = { 297-326 },
  URL = { http://cvgmt.sns.it/paper/213/ },
  note = { cvgmt preprint}
}