@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/