@article{JRAM_1915__145_149433,
     author = {M.E. Cartan},
     title = {Sur l'int\'egration de certains syst\`emes ind\'etermin\'es d'\'equations diff\'erentielles.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {86--91},
     publisher = {mathdoc},
     volume = {145},
     year = {1915},
     zbl = {45.0472.03},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1915__145_149433/}
}