1. N. Alon, Z. Füredi andM. Katchalski, Separating pairs of points by standard boxes,European Journal of Combinatorics,6 (1985), 205–210.
2. I. Bárány andJ. Lehel, Covering with Euclidean boxes,submitted for publication.
3. L. Danzer, B. Grünbaum andV. Klee, Helly’s theorem and its relatives,in: Proc. of Symp. in Pure Mathematics,VII. Convexity, AMS, Providence, 1963.
4. P. Erdős andZ. Füredi, The greatest angle amongn points in thed-dimensional Euclidean space,Annals of Discrete Math. 17 (1983), 275–283.
5. P. Erdős andG. Szekeres, On some extremum problems in elementary geometry,Ann. Univ. Sci. Budapest, Eötvös Sect. Math. III/IV (1960–61), 53–62.