Hinged dissection of polygons is hard
Robert Aubrey Hearn,
Erik D. Demaine,
and Greg N. Frederickson
Proc. 15th Canad. Conf. Computational Geometry (CCCG 2003), Dalhousie Univ., Faculty of Computer Science, Aug 2003, pp. 98–102
http://torch.cs.dal.ca/~cccg/papers/45.pdf
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