Maintaining the visibility map of spheres while moving the viewpoint on a circle at infinity
Hans-Peter Lenhof
and Michiel Smid
Algorithmica 13:301–312, 1995
Proc. 3rd Scandinavian Worksh. Algorithm Theory (SWAT 1992), Lecture Notes in Computer Science 621, Otto Nurmi
and Esko Ukkonen, ed., Springer-Verlag, 1992, pp. 388–398
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