@article{JRAM_1888__102_148707,
     author = {Leo K\"onigsberger},
     title = {Untersuchungen \"uber die {Existenz} eines {Functionaltheorems.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {224--236},
     publisher = {mathdoc},
     volume = {102},
     year = {1888},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1888__102_148707/}
}