@article{JRAM_1840__20_147103,
     author = {Christian Ludwig Gerling},
     title = {Fragment \"uber die {Begr\"undung} des {Begriffs} der {Ebene.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {332--336},
     publisher = {mathdoc},
     volume = {20},
     year = {1840},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1840__20_147103/}
}