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"PushPush and Push-1 are NP-hard in 2D"
Erik D. Demaine, Martin L. Demaine, Joseph O'Rourke (2000)
- Erik D. Demaine, Martin L. Demaine, Joseph O'Rourke:
PushPush and Push-1 are NP-hard in 2D. CoRR cs.CG/0007021 (2000)
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