@article{AIF_1966__16_2_1_0,
     author = {Vaillant, Jean},
     title = {Caract\'eristiques multiples et bicaract\'eristiques des syst\`emes d'\'equations aux d\'eriv\'ees partielles lin\'eaires et \`a coefficients constants},
     journal = {Annales de l'Institut Fourier},
     pages = {1--29},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {16},
     number = {2},
     year = {1966},
     doi = {10.5802/aif.235},
     mrnumber = {35 #1325},
     zbl = {0154.10701},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.5802/aif.235/}
}