Three dimensional weak visibility: complexity and applications
Cao An Wang
and Binhai Zhu
Proc. 1st Int. Conf. Computing & Combinatorics (COCOON 1995), Lecture Notes in Computer Science 959, Ding-Zhu Du
and Ming Li, ed., Springer-Verlag, 1995, pp. 51–60
Theoretical Computer Science 234(1–2):219–232, Mar 2000
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