Tetsuo Asano Naoki Katoh Hisao Tamaki Takeshi Tokuyama Voronoi Diagram with Respect to Criteria on Vision Information. 25-32 2007 conf/isvd/2007 ISVD http://doi.ieeecomputersociety.org/10.1109/ISVD.2007.44 db/conf/isvd/isvd2007.html#AsanoKTT07