@Article{ 
  ambpao97,
  author = { Ambrosio, Luigi and Paolini, Emanuele },
  title = { Partial regularity for quasi minimizers of perimeter },
  journal = { Ricerche di Matematica },
  year = { 1999 },
  volume = { 48 },
  number = { supplemento },
  pages = { 167-186 },
  URL = { http://cvgmt.sns.it/paper/1275/ },
  note = { cvgmt preprint}
}