Coloring objects built from bricks
Suzanne Gallagher
and Joseph O'Rourke
Proc. 15th Canad. Conf. Computational Geometry (CCCG 2003), Dalhousie Univ., Faculty of Computer Science, Aug 2003, pp. 56–59
http://torch.cs.dal.ca/~cccg/papers/25.pdf
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