Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{DCG_1986__1_130984, author = {E. Welzl}, title = {More on {k-Sets} of {Finite} {Sets} in the {Plane.}}, journal = {Discrete & computational geometry}, pages = {95--100}, publisher = {mathdoc}, volume = {1}, year = {1986}, zbl = {0598.52007}, url = {http://geodesic.mathdoc.fr/item/DCG_1986__1_130984/} }
E. Welzl. More on k-Sets of Finite Sets in the Plane.. Discrete & computational geometry, Tome 1 (1986), pp. 95-100. http://geodesic.mathdoc.fr/item/DCG_1986__1_130984/