@article{DCG_1989__4_6_131076,
     author = {I. B\'ar\'any and J.H. Schmerl and S.J. Sidney and J. Urrutia},
     title = {A {Combinatorial} {Result} {About} {Points} and {Balls} in {Euclidean} {Space.}},
     journal = {Discrete & computational geometry},
     pages = {259--262},
     publisher = {mathdoc},
     volume = {4},
     number = {6},
     year = {1989},
     zbl = {0673.52009},
     url = {http://geodesic.mathdoc.fr/item/DCG_1989__4_6_131076/}
}