@Article{ 
  ambdel,
  author = { Ambrosio, Luigi and De Lellis, Camillo },
  title = { Existence of solutions for a class of hyperbolic systems of conservation laws in several space dimensions },
  journal = { International Mathematics Research Notices },
  year = { 2003 },
  number = { 41 },
  pages = { 2205-2220 },
  URL = { http://cvgmt.sns.it/paper/503/ },
  note = { cvgmt preprint}
}