@Article{ 
  delottwes02,
  author = { De Lellis, Camillo and Otto, Felix and Westdickenberg, Michael },
  title = { Structure of entropy solutions for multi--dimensional conservation laws },
  journal = { Archive for Rational Mechanics and Analysis },
  year = { 2003 },
  volume = { 170 },
  pages = { 137-184 },
  URL = { http://cvgmt.sns.it/paper/99/ },
  note = { cvgmt preprint}
}