@Misc{ 
  TeaBelPao15,
  author = { Bellettini, Giovanni and Paolini, Maurizio and Tealdi, Lucia },
  title = { Semicartesian surfaces and  the relaxed area of  maps from the plane to the plane with a line discontinuity },
  journal = {  },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2762/ },
  note = { cvgmt preprint}
}