@Misc{ 
  luia,
  author = { Ambrosio, Luigi },
  title = { Transport equation and Cauchy problem for BV vector fields },
  journal = { Inventiones Mathematicae },
  year = { 2003 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/436/ },
  note = { cvgmt preprint}
}