The visibility-Voronoi complex and its applications 
@article{wvh-vvcia-07 
, author = "R. Wein, J.P. van den Berg and D. Halperin" 
, title = "The visibility-Voronoi complex and its applications" 
, journal = "Computational Geometry: Theory and Applications" 
, volume = "36" 
, number = 1 
, year = 2007
, pages = "66--78" 
}