Robert-Paul Mario Berretty,
Mark Overmars,
and A. Frank van der Stappen
Computational Geometry Theory & Applications 21(1–2):21–38, Jan 2002
Tech. report UU-CS-2000-21, Univ. Utrecht, Dept. of Computer Science, 2000
ftp://ftp.cs.uu.nl/pub/RUU/CS/techreps/CS-2000/2000-21.ps.gz
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