@article{JRAM_1835__13_146924,
     author = {C.A. Bretschneider},
     title = {Beitr\"age zur sph\"arischen {Trigonometrie.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {85--92},
     publisher = {mathdoc},
     volume = {13},
     year = {1835},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1835__13_146924/}
}