TY - JOUR AU - Goldschmidt, Hubert TI - Prolongations of linear partial differential equations. I. A conjecture of Élie Cartan JO - Annales scientifiques de l'École Normale Supérieure PY - 1968 DA - 1968/// SP - 417 EP - 444 VL - Ser. 4, 1 IS - 3 PB - Elsevier UR - http://www.numdam.org/articles/10.24033/asens.1168/ UR - https://zbmath.org/?q=an%3A0167.09402 UR - https://www.ams.org/mathscinet-getitem?mr=38 #3888 UR - https://doi.org/10.24033/asens.1168 DO - 10.24033/asens.1168 LA - en ID - ASENS_1968_4_1_3_417_0 ER -