@article{DCG_1989__4_6_131068,
     author = {M. Katz},
     title = {Diameter-Extremal {Subsets} of {Spheres.}},
     journal = {Discrete & computational geometry},
     pages = {117--138},
     publisher = {mathdoc},
     volume = {4},
     number = {6},
     year = {1989},
     zbl = {0663.52008},
     url = {http://geodesic.mathdoc.fr/item/DCG_1989__4_6_131068/}
}