@Misc{ 
  Col15,
  author = { Colombo, Maria },
  title = { Flows of non-smooth vector fields and degenerate elliptic equations },
  journal = {  },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2755/ },
  note = { cvgmt preprint}
}