@Misc{ 
  ambdepkir,
  author = { Ambrosio, Luigi and De Philippis, Guido and Kirchheim, Bernd },
  title = { Regularity of optimal transport maps and partial differential inclusions },
  journal = { Rend. Lincei - Mat. e Appl. },
  year = { 2011 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1165/ },
  note = { cvgmt preprint}
}