Approximation algorithms for terrain guarding
Information Processing Letters
How Many People Can Hide in a Terrain?
ISAAC '99 Proceedings of the 10th International Symposium on Algorithms and Computation
On the Planar Two-Watchtower Problem
COCOON '01 Proceedings of the 7th Annual International Conference on Computing and Combinatorics
Positioning Guards at Fixed Height Above a Terrain - An Optimum Inapproximability Result
ESA '98 Proceedings of the 6th Annual European Symposium on Algorithms
Guarding a terrain by two watchtowers
SCG '05 Proceedings of the twenty-first annual symposium on Computational geometry
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