Mark T. de Berg
and Marc J. van Kreveld
Proc. 1st Eur. Symp. Algorithms (ESA 1993), Lecture Notes in Computer Science 726, Thomas Lengauer, ed., Springer-Verlag, Sep 1993, pp. 121–132
Tech. report UU-CS-1994-02, Univ. Utrecht, Dept. of Computer Science, 11 Jan 1994
ftp://ftp.cs.ruu.nl/pub/RUU/CS/techreps/CS-1994/1994-02.ps.gz
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