@article{BSMF_1931__59__40_0,
author = {Feraud, Lucien},
title = {Formes de Pfaff et syst\`emes lagrangiens},
journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
volume = {59},
year = {1931},
pages = {40-45},
doi = {10.24033/bsmf.1171},
zbl = {0002.20903},
language = {fr},
url = {http://dml.mathdoc.fr/item/BSMF_1931__59__40_0}
}
Feraud, Lucien. Formes de Pfaff et systèmes lagrangiens. Bulletin de la Société Mathématique de France, Tome 59 (1931) pp. 40-45. doi : 10.24033/bsmf.1171. http://gdmltest.u-ga.fr/item/BSMF_1931__59__40_0/