@article{GDZPPN002256584, title = {Das Apollonische Problem}, journal = {Mathematische Annalen}, volume = {49}, year = {1897}, pages = {497-542}, zbl = {28.0518.06}, url = {http://dml.mathdoc.fr/item/GDZPPN002256584} }
Study, E. Das Apollonische Problem. Mathematische Annalen, Tome 49 (1897) pp. 497-542. http://gdmltest.u-ga.fr/item/GDZPPN002256584/