@article{AIHPC_1991__8_3-4_231_0,
     author = {Dafermos, C. M. and Geng, X.},
     title = {Generalized characteristics uniqueness and regularity of solutions in a hyperbolic system of conservation laws},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {231--269},
     publisher = {Gauthier-Villars},
     volume = {8},
     number = {3-4},
     year = {1991},
     mrnumber = {1127926},
     zbl = {0776.35033},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPC_1991__8_3-4_231_0/}
}