@article{MAN_1926__95_159144,
     author = {A. Wintner},
     title = {Zur {Theorie} der unendlichen {Differentialsysteme}},
     journal = {Mathematische Annalen},
     pages = {544--556},
     publisher = {mathdoc},
     volume = {95},
     year = {1926},
     zbl = {52.0403.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1926__95_159144/}
}