@article{MZ_1952__56_169277,
     author = {Rolf Nevanlinna},
     title = {Beweis des {Satzes} \"uber die {Vertauschbarkeit} der {Differentiationen.}},
     journal = {Mathematische Zeitschrift},
     pages = {120--121},
     publisher = {mathdoc},
     volume = {56},
     year = {1952},
     zbl = {0047.29303},
     url = {http://geodesic.mathdoc.fr/item/MZ_1952__56_169277/}
}