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"Tetris is hard, even to approximate."
Ron Breukelaar et al. (2004)
- Ron Breukelaar, Erik D. Demaine, Susan Hohenberger, Hendrik Jan Hoogeboom

, Walter A. Kosters, David Liben-Nowell:
Tetris is hard, even to approximate. Int. J. Comput. Geom. Appl. 14(1-2): 41-68 (2004)

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