A near-quadratic algorithm for the alpha-connected two-center decision problem
Po-Hsueh Huang,
Yin Te Tsai,
and Chuan Ti Tang
Proc. 14th Canad. Conf. Computational Geometry (CCCG), Stephen Wismath, ed., Univ. of Lethbridge, Dept. of Mathematics and Computer Science, Aug 2002, pp. 133–136
http://www.cs.uleth.ca/~wismath/cccg/papers/36.ps
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