@article{MZ_1943__49_169024,
     author = {E. Kamke},
     title = {Bemerkungen zur {Theorie} der partiellen {Differentiallgiechungen} erster ordnung},
     journal = {Mathematische Zeitschrift},
     pages = {256--284},
     publisher = {mathdoc},
     volume = {49},
     year = {1943},
     zbl = {0028.15803},
     url = {http://geodesic.mathdoc.fr/item/MZ_1943__49_169024/}
}