@Misc{ 
  del06b,
  author = { De Lellis, Camillo },
  title = { Lecture notes on rectifiable sets, densities, and tangent measures  },
  journal = { Zurich Lectures in Advanced Mathematics. European Mathematical Society (EMS), Zürich. },
  year = { 2008 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1081/ },
  note = { cvgmt preprint}
}