@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/