Pankaj K. Agarwal, Boris Aronov, Vladlen Koltun, Micha Sharir. On lines avoiding unit balls in three dimensions. In Jack Snoeyink, Jean-Daniel Boissonnat, editors, Proceedings of the 20th ACM Symposium on Computational Geometry, Brooklyn, New York, USA, June 8-11, 2004. pages 36-45, ACM, 2004. [doi]
Abstract is missing.