@article{JEMS_2003_5_2_a1,
     author = {Camillo De Lellis and Felix Otto},
     title = {Structure of entropy solutions to the eikonal equation},
     journal = {Journal of the European Mathematical Society},
     pages = {107--145},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {2003},
     doi = {10.1007/s10097-002-0048-7},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10097-002-0048-7/}
}