@article{SEDP_1980-1981____A17_0,
     author = {Alinhac, S.},
     title = {Non-unicit\'e du probl\`eme de {Cauchy} pour des op\'erateurs de type principal},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:16},
     pages = {1--8},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1980-1981},
     zbl = {0495.35009},
     language = {fr},
     url = {http://archive.numdam.org/item/SEDP_1980-1981____A17_0/}
}