@Misc{ 
  Dwe17,
  author = { Dweik, Samer },
  title = { Lack of regularity of the transport density in the Monge problem },
  journal = {  },
  year = { 2017 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3396/ },
  note = { cvgmt preprint}
}