On the planar two-watchtower problem{}

Sergei N. Bespamyatnikh, Zhixiang Chen, Kanliang Wang, and Binhai Zhu
Proc. 7th Int. Conf. Computing & Combinatorics (COCOON 2001), Lecture Notes in Computer Science 2108, Jie Wang, ed., Springer-Verlag, 2001, pp. 121–130

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