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"Packing 2×2 unit squares into grid polygons is NP-complete."
Dania El-Khechen et al. (2009)
- Dania El-Khechen, Muriel Dulieu, John Iacono, Nikolaj van Omme:
Packing 2×2 unit squares into grid polygons is NP-complete. CCCG 2009: 33-36
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