@Article{ 
  delott02,
  author = { De Lellis, Camillo and Otto, Felix },
  title = { Structure of entropy solutions to the eikonal equation },
  journal = { J. Eur. Math. Soc. },
  year = { 2003 },
  volume = { 5 },
  number = { 2 },
  pages = { 107-145 },
  URL = { http://cvgmt.sns.it/paper/743/ },
  note = { cvgmt preprint}
}