@Misc{ 
  GhiLam18,
  author = { Ghiraldin, Francesco and Lamy, Xavier },
  title = { Optimal Besov differentiability for entropy solutions of the eikeonal equation },
  journal = {  },
  year = { 2018 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3760/ },
  note = { cvgmt preprint}
}