Lenhof, Hans-Peter Algorithms and Complexity, MPI for Informatics, Max Planck Society;
Smid, Michiel Algorithms and Complexity, MPI for Informatics, Max Planck Society;
https://rdcu.be/dtXNU (Publisher version)
Lenhof, H.-P., & Smid, M. (1995). Maintaining the Visibility Map of Spheres while Moving the Viewpoint on a Circle at Infinity. Algorithmica, 13(3), 301-312. doi:10.1007/BF01190509.