@article{JRAM_1833__10_146836,
     author = {J.P. Gr\"uson},
     title = {Zur {Elementar-Geometrie.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {275--278},
     year = {1833},
     volume = {10},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1833__10_146836/}
}