Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MAN_1880__16_156902, author = {Voss}, title = {Geometrische {Interpretation} der {Differentialgleichnng} {P} d x + {Qdy} + {Rdz} = 0}, journal = {Mathematische Annalen}, pages = {556--559}, publisher = {mathdoc}, volume = {16}, year = {1880}, zbl = {12.0278.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1880__16_156902/} }
Voss. Geometrische Interpretation der Differentialgleichnng P d x + Qdy + Rdz = 0. Mathematische Annalen, Tome 16 (1880), pp. 556-559. http://geodesic.mathdoc.fr/item/MAN_1880__16_156902/