CGAL 5.1.3 - Cone-Based Spanners
Bibliography
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M. Chang, N. Huang, and C. Tang. An optimal algorithm for constructing oriented voronoi diagrams and geographic neighborhood graphs. Information Processing Letters, 35:255–260, 1990.

[2]

G. Narasimhan and M. Smid. Geometric Spanner Networks. Cambridge University Press, 2007.