@incollection{JEDP_1976____A10_0,
     author = {M\'etivier, Guy},
     title = {Fonction spectrale et valeurs propres d'une classe d'op\'erateurs non elliptiques},
     booktitle = {},
     series = {Journ\'ees \'equations aux d\'eriv\'ees partielles},
     eid = {10},
     pages = {1--54},
     year = {1976},
     publisher = {Ecole polytechnique},
     doi = {10.5802/jedp.145},
     language = {fr},
     url = {https://www.numdam.org/articles/10.5802/jedp.145/}
}