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"Guarding lines and 2-link polygons is apx-hard."
Björn Brodén, Mikael Hammar, Bengt J. Nilsson (2001)
- Björn Brodén, Mikael Hammar, Bengt J. Nilsson:
Guarding lines and 2-link polygons is apx-hard. CCCG 2001: 45-48
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