@incollection{JEDP_1985___1_A6_0,
     author = {Hanouzet, Bernard and Joly, Jean-Luc},
     title = {Formes bilin\'eaires compatibles avec un syst\`eme hyperbolique et probl\`eme de {Cauchy}},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {6},
     pages = {1--12},
     publisher = {Ecole polytechnique},
     number = {1},
     year = {1985},
     mrnumber = {832004},
     zbl = {0636.35050},
     language = {fr},
     url = {http://archive.numdam.org/item/JEDP_1985___1_A6_0/}
}