@incollection{AST_1973__2-3__160_0,
     author = {Baouendi, M. S. and Goulaouic, C.},
     title = {Probl\`emes de {Cauchy} relatifs \`a une surface initiale caract\'eristique - applications},
     booktitle = {Colloque International C.N.R.S. sur les \'equations aux d\'eriv\'ees partielles lin\'eaires},
     series = {Ast\'erisque},
     pages = {160--170},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {2-3},
     year = {1973},
     mrnumber = {410043},
     zbl = {0278.35003},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1973__2-3__160_0/}
}