@article{JEDP_1977____206_0,
     author = {Wagschal, Claude},
     title = {Probl\`eme de {Cauchy} \`a caract\'eristiques multiples dans les classes de {Gevrey}},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     pages = {206--216},
     publisher = {Ecole polytechnique},
     year = {1977},
     mrnumber = {80f:35004},
     language = {fr},
     url = {http://archive.numdam.org/item/JEDP_1977____206_0/}
}