@Misc{ 
  giucla01,
  author = { Buttazzo, Giuseppe and Timofte, Claudia },
  title = { On The Relaxation of Some Optimal Partition Problems  },
  journal = {  },
  year = { 2001 },
  pages = { 11 },
  URL = { http://cvgmt.sns.it/paper/1631/ },
  note = { cvgmt preprint}
}