@article{GDZPPN002038722, title = {A case of the 3-dimensional problem of Appollonius.}, journal = {Aequationes mathematicae}, volume = {41}, year = {1991}, pages = {172-186}, zbl = {0739.51014}, url = {http://dml.mathdoc.fr/item/GDZPPN002038722} }
Wilker, J.B.; Paluszny, M. A case of the 3-dimensional problem of Appollonius.. Aequationes mathematicae, Tome 41 (1991) pp. 172-186. http://gdmltest.u-ga.fr/item/GDZPPN002038722/