@article{JRAM_1929__160_149683,
     author = {Stephan Lipka},
     title = {Eine {Verallgemeinerung} des {Rouch\'eschen} {Satzes.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {143--150},
     publisher = {mathdoc},
     volume = {160},
     year = {1929},
     zbl = {55.0175.05},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1929__160_149683/}
}