title = {On the complexity of visibility problems with moving viewpoints},
author = {Peter Gritzmann and Thorsten Theobald},
booktitle = {Combinatorial and Computational Geometry},
number = {52},
editor = {Jacob E. Goodman and J{\'a}nos Pach and Emo Welzl},
series = {MSRI Publications},
publisher = {Cambridge Univ. Press},
pages = {377--397},
year = {2005}}

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