%0 Journal Article
%A M. Sharir
%A B. Aronov
%A D.Q. Naiman
%A J. Pack
%T An Invariant Property of Balls in Arrangements of Hyperplanes.
%J Discrete & computational geometry
%D 1993
%P 421-426
%V 10
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DCG_1993__10_2_131282/
%F DCG_1993__10_2_131282