Tamal K. Dey
and Herbert Edelsbrunner
Discrete & Computational Geometry 12:281–289, 1994
Proc. 9th Symp. Computational Geometry, ACM, May 1993, pp. 270–273
Tech. report UIUCDCS-R-92-1781, Univ. of Illinois, Urbana-Champaign, Dept. of Computer Science, Nov 1992
http://www.cs.uiuc.edu/Dienst/UI/2.0/Describe/ncstrl.uiuc_cs/UIUCDCS-R-92-1781
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