@article{SEDP_1976-1977____A7_0,
     author = {Metivier, G.},
     title = {Fonction spectrale d'op\'erateurs non elliptiques},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:7},
     pages = {1--14},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1976-1977},
     zbl = {0373.47025},
     language = {fr},
     url = {http://archive.numdam.org/item/SEDP_1976-1977____A7_0/}
}