@Article{ 
  ambdel04,
  author = { Ambrosio, Luigi and De Lellis, Camillo },
  title = { A note on admissible solutions of 1d scalar conservation laws and 2d Hamilton-Jacobi equations },
  journal = { J. Hyperbolic Diff. Equ. },
  year = { 2004 },
  volume = { 1 },
  number = { 4 },
  pages = { 813-826 },
  URL = { http://cvgmt.sns.it/paper/1407/ },
  note = { cvgmt preprint}
}