@article{MAN_1897__49_157859,
     author = {E. Study},
     title = {Das {Apollonische} {Problem}},
     journal = {Mathematische Annalen},
     pages = {497--542},
     year = {1897},
     volume = {49},
     zbl = {28.0518.06},
     url = {http://geodesic.mathdoc.fr/item/MAN_1897__49_157859/}
}