Erik D. Demaine,
Martin L. Demaine,
David Eppstein,
and Erich Friedman
Proc. 11th Canad. Conf. Computational Geometry, Aug 1999
Computational Geometry Theory & Applications 31(3):237–262, Jun 2005
ACM Computing Research Repository, cs.CG/9907018
http://www.cs.ubc.ca/conferences/CCCG/elec_proc/fp37.pdf
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