@article{MZ_1957__67_169683,
     author = {Otto Endler},
     title = {Differentiation in algebraischen {Funktionenk\"orpern} von n {Variablen.}},
     journal = {Mathematische Zeitschrift},
     pages = {413--427},
     publisher = {mathdoc},
     volume = {67},
     year = {1957},
     zbl = {0105.03101},
     url = {http://geodesic.mathdoc.fr/item/MZ_1957__67_169683/}
}