@article{GDZPPN000364010, title = {Helly-Type Theorems for Spheres.}, journal = {Discrete \& computational geometry}, volume = {4}, year = {1989}, pages = {279-286}, zbl = {0671.52009}, url = {http://dml.mathdoc.fr/item/GDZPPN000364010} }
Maehara, H. Helly-Type Theorems for Spheres.. Discrete & computational geometry, Tome 4 (1989) pp. 279-286. http://gdmltest.u-ga.fr/item/GDZPPN000364010/