Matthias Fischer,
Tamás Lukovszki,
and Martin Ziegler
Proc. 11th Canad. Conf. Computational Geometry, Aug 1999, pp. 47–50
http://www.cs.ubc.ca/conferences/CCCG/elec_proc/fp36.pdf
http://www.uni-paderborn.de/cs/ag-madh/WWW/DFG-SPP/Paper/CCCG99FLZ_full.pdf
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