title = {Maintaining the visibility map of spheres while moving the viewpoint on a circle at infinity},
author = {Hans-Peter Lenhof and Michiel Smid},
booktitle = {Proc. 3rd Scandinavian Worksh. Algorithm Theory (SWAT 1992)},
number = {621},
editor = {Otto Nurmi and Esko Ukkonen},
series = {Lecture Notes in Computer Science},
publisher = {Springer-Verlag},
pages = {388--398},
year = {1992}}

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