@article{GDZPPN000363022, title = {More on k-Sets of Finite Sets in the Plane.}, journal = {Discrete \& computational geometry}, volume = {1}, year = {1986}, pages = {95-100}, zbl = {0598.52007}, url = {http://dml.mathdoc.fr/item/GDZPPN000363022} }
Welzl, E. More on k-Sets of Finite Sets in the Plane.. Discrete & computational geometry, Tome 1 (1986) pp. 95-100. http://gdmltest.u-ga.fr/item/GDZPPN000363022/