@incollection{AST_1974__19__3_0,
     author = {Alinhac, Serge},
     title = {Syst\`emes hyperboliques singuliers},
     booktitle = {Sur quelques \'equations aux d\'eriv\'ees partielles singuli\`eres},
     series = {Ast\'erisque},
     pages = {3--24},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {19},
     year = {1974},
     mrnumber = {358088},
     zbl = {0324.35059},
     language = {fr},
     url = {http://www.numdam.org/item/AST_1974__19__3_0/}
}