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@article{DCG_1989__4_6_131079, author = {H. Maehara}, title = {Helly-Type {Theorems} for {Spheres.}}, journal = {Discrete & computational geometry}, pages = {279--286}, publisher = {mathdoc}, volume = {4}, number = {6}, year = {1989}, zbl = {0671.52009}, url = {http://geodesic.mathdoc.fr/item/DCG_1989__4_6_131079/} }
H. Maehara. Helly-Type Theorems for Spheres.. Discrete & computational geometry, Tome 4 (1989) no. 6, pp. 279-286. http://geodesic.mathdoc.fr/item/DCG_1989__4_6_131079/