@incollection{JEDP_1990____A17_0,
     author = {Bezard, Max},
     title = {Probl\`eme de {Riemann} g\'en\'eralis\'e pour un syst\`eme de lois de conservation vraiment non lin\'eaire multidimensionnel},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {17},
     pages = {1--11},
     publisher = {Ecole polytechnique},
     year = {1990},
     mrnumber = {1069967},
     zbl = {0704.35092},
     language = {fr},
     url = {http://archive.numdam.org/item/JEDP_1990____A17_0/}
}