Ferran Hurtado Rolf Klein Elmar Langetepe Vera Sacristan The weighted farthest color Voronoi diagram on trees and graphs. 13-26 2004 27 Comput. Geom. 1 http://dx.doi.org/10.1016/j.comgeo.2003.07.003 db/journals/comgeo/comgeo27.html#HurtadoKLS04