@article{JRAM_1880__89_183438,
     author = {G. Frobenius},
     title = {Ueber die {Leibnitzsche} {Reihe.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {262--264},
     publisher = {mathdoc},
     volume = {89},
     year = {1880},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1880__89_183438/}
}