@article{AIF_1965__15_2_225_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 = {225--311}, publisher = {Institut Fourier}, volume = {15}, number = {2}, year = {1965}, doi = {10.5802/aif.215}, zbl = {0139.05304}, mrnumber = {32 #7919}, language = {fr}, url = {http://www.numdam.org/articles/10.5802/aif.215/} }