@article{ASENS_1908_3_25__255_0,
     author = {Delassus, \'Etienne},
     title = {Sur les invariants des syst\`emes diff\'erentiels},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {255--318},
     publisher = {Elsevier},
     volume = {3e s{\'e}rie, 25},
     year = {1908},
     doi = {10.24033/asens.592},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/asens.592/}
}