@article{JEDP_1979____A12_0,
     author = {Zuily, Claude},
     title = {Unicit\'e du probl\`eme de {Cauchy} pour une classe d'op\'erateurs diff\'erentiels \`a caract\'eristiques de multiplicit\'e constante},
     journal = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {12},
     pages = {1--5},
     publisher = {Ecole polytechnique},
     year = {1979},
     mrnumber = {83c:35003},
     zbl = {0409.35001},
     language = {fr},
     url = {http://archive.numdam.org/item/JEDP_1979____A12_0/}
}