@incollection{AST_1973__2-3__108_0,
     author = {Bony, J. M. and Schapira, P.},
     title = {Solutions analytiques et hyperfonctions du probl\`eme de {Cauchy} pour les op\'erateurs hyperboliques non stricts},
     booktitle = {Colloque International C.N.R.S. sur les \'equations aux d\'eriv\'ees partielles lin\'eaires},
     series = {Ast\'erisque},
     pages = {108--116},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {2-3},
     year = {1973},
     mrnumber = {499783},
     zbl = {0289.35016},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1973__2-3__108_0/}
}