@article{SMJ_1936-1937__4__A3_0,
     author = {Cartan, Henri},
     title = {Syst\`emes de {Pfaff} (suite)},
     journal = {S\'eminaire de Math\'ematiques},
     note = {talk:3},
     pages = {1--30},
     year = {1936-1937},
     publisher = {\'Ecole Normale Sup\'erieure},
     volume = {4},
     language = {fr},
     url = {https://www.numdam.org/item/SMJ_1936-1937__4__A3_0/}
}