An improved bound for <i>k</i>-sets in three dimensions.

Micha Sharir Shakhar Smorodinsky Gábor Tardos An improved bound for <i>k</i>-sets in three dimensions. 43-49 2000 Symposium on Computational Geometry http://doi.acm.org/10.1145/336154.336173 db/conf/compgeom/compgeom2000.html#SharirST00