@article{MAN_1908__65_158347,
     author = {A. Timpe},
     title = {\"Uber die {Umkehrbarkeit} der {Differentiationsordnung}},
     journal = {Mathematische Annalen},
     pages = {310--312},
     publisher = {mathdoc},
     volume = {65},
     year = {1908},
     zbl = {39.0351.10},
     url = {http://geodesic.mathdoc.fr/item/MAN_1908__65_158347/}
}