MathSciNet bibliographic data MR801812 (86m:68135) 68U05 Welzl, Emo Constructing the visibility graph for \$n\$$n$ line segments in \$O(n\sp 2)\$$O(n\sp 2)$ time. Inform. Process. Lett. 20 (1985), no. 4, 167–171. Article

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