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"Two NP-Hard Art-Gallery Problems for Ortho-Polygons."
Dietmar Schuchardt, Hans-Dietrich Hecker (1995)
- Dietmar Schuchardt, Hans-Dietrich Hecker:
Two NP-Hard Art-Gallery Problems for Ortho-Polygons. Math. Log. Q. 41: 261-267 (1995)
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