A geometric proof of the combinatorial bounds for the number of optimal solutions for the 2-center Euclidean problem
Jurek W. Jaromczyk
and Mirosław Kowaluk
Proc. 7th Canad. Conf. Computational Geometry, Aug 1995, pp. 19–24
Computational Geometry Theory & Applications 14(4):187–196, Dec 1999
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