@article{ASENS_1940_3_57__201_0,
     author = {Lauriers, Gu\'erard des},
     title = {Sur les syst\`emes diff\'erentiels du second ordre qui admettent un groupe continu fini de transformations},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {201--315},
     publisher = {Elsevier},
     volume = {3e s{\'e}rie, 57},
     year = {1940},
     doi = {10.24033/asens.885},
     mrnumber = {3,241e},
     zbl = {0026.01603},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.24033/asens.885/}
}