@article{MAN_1870__2_156465,
     author = {Hierholzer},
     title = {Ueber {Kegelschnitte} im {Raume.}},
     journal = {Mathematische Annalen},
     pages = {563--586},
     publisher = {mathdoc},
     volume = {2},
     year = {1870},
     url = {http://geodesic.mathdoc.fr/item/MAN_1870__2_156465/}
}