Ununfoldable polyhedra with triangular faces

Marshall Wayne Bern, Erik D. Demaine, David Eppstein, Eric Heng-Shiang Kuo, Andrea Mantler, and Jack Snoeyink
Proc. 4th CGC Worksh. Computational Geometry, Oct 1999
http://www.cs.jhu.edu/~cgc/abstracts99/old/eric.uptf.ps

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