Michael S. Horn Matthew Tobiasz Chia Shen Visualizing Biodiversity with Voronoi Treemaps. 265-270 2009 ISVD http://doi.ieeecomputersociety.org/10.1109/ISVD.2009.22 conf/isvd/2009 db/conf/isvd/isvd2009.html#HornTS09