@article{AIF_1982__32_3_39_0,
     author = {Mohamed, Abderemane},
     title = {\'Etude spectrale d'op\'erateurs hypoelliptiques \`a caract\'eristiques multiples. {I}},
     journal = {Annales de l'Institut Fourier},
     pages = {39--90},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {32},
     number = {3},
     year = {1982},
     doi = {10.5802/aif.880},
     mrnumber = {85e:35093a},
     zbl = {0488.35079},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.5802/aif.880/}
}