@article{JRAM_1835__13_146933,
     author = {W.A. F\"orstemann},
     title = {Umkehrung der {Ptolom\"aischen} {Satzes.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {233--236},
     publisher = {mathdoc},
     volume = {13},
     year = {1835},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1835__13_146933/}
}