Your search returned the following 3 documents:
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Improved Approximations for Guarding 1.5-Dimensional Terrains
Khaled Elbassioni, Erik Krohn, Domagoj Matijevic, Julian Mestre, and Domagoj Severdija
Algorithmica 60 (2): 451-463, 2011
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Improved Approximation Algorithms for 1.5D Terrain Guarding
Khaled Elbassioni, Erik Krohn, Domagoj Matijevic, Julián Mestre, and Domagoj Severdija
In: Proceedings of the 26th International Symposium on Theoretical Aspects of Computer Science (STACS), Freiburg - Germany, 2009, 361-371
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Improved Approximations for Guarding 1.5-Dimensional Terrains
Khaled M. Elbassioni, Erik Krohn, Domagoj Matijevic, Julián Mestre, and Domagoj Severdija
Algorithmica Online First: 1-13, 2009