@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/}
}