@article{JRAM_1892__109_148837,
     author = {C. Koehler},
     title = {Beweis eines {Satzes} aus der {Analysis} {Situs.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {118--120},
     publisher = {mathdoc},
     volume = {109},
     year = {1892},
     zbl = {24.0506.03},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1892__109_148837/}
}