@article{JRAM_1909__136_149316,
     author = {Arthur Wieferich},
     title = {Zur {Dreiecksgeometrie.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {303--305},
     publisher = {mathdoc},
     volume = {136},
     year = {1909},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1909__136_149316/}
}