@article{MAN_1892__40_157606,
     author = {E. Study},
     title = {Ueber {Systeme} von {Kegelschnitten.}},
     journal = {Mathematische Annalen},
     pages = {563--578},
     publisher = {mathdoc},
     volume = {40},
     year = {1892},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1892__40_157606/}
}