@article{MAN_1898__50_157879,
     author = {C. Roussian},
     title = {Sur les formes canoniques d'une expression diff\'erentielle {X1} dx1 + {-X2} dx2 +...... + {Xpdxp.}},
     journal = {Mathematische Annalen},
     pages = {247--260},
     publisher = {mathdoc},
     volume = {50},
     year = {1898},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/MAN_1898__50_157879/}
}