@article{JRAM_1849__38_183274,
     author = {Christoph Gudermann},
     title = {De pendulis sphaericis, et de curvis, quae ab ipsis describuntur sphaericis.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {185--215},
     publisher = {mathdoc},
     volume = {38},
     year = {1849},
     language = {la},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1849__38_183274/}
}