Artur Andrzejak, Boris Aronov, Sariel Har-Peled, Raimund Seidel, and Emo Welzl Proc. 14th Symp. Computational Geometry, ACM, Jun 1998, pp. 192–199 http://www.inf.ethz.ch/personal/andrzeja/my-papers/kset.ps.gz
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