Independent Collections of Translates of Boxes and a Conjecture due to Grünbaum. D.Q. Naiman; H.P. Wynn — 1993 Discrete & computational geometry
An Invariant Property of Balls in Arrangements of Hyperplanes. M. Sharir; B. Aronov; D.Q. Naiman; J. Pack — 1993 Discrete & computational geometry