@article{JRAM_1980__316_152239,
     author = {Norbert Steinmetz},
     title = {Ein {Malmquistscher} {Satz} f\"ur algebraische {Differentialgleichungen} erster {Ordnung.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {44--53},
     publisher = {mathdoc},
     volume = {316},
     year = {1980},
     zbl = {0426.34011},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1980__316_152239/}
}