Donald H. House Alethea Bair Colin Ware An Approach to the Perceptual Optimization of Complex Visualizations. 509-521 2006 12 IEEE Trans. Vis. Comput. Graph. 4 http://doi.ieeecomputersociety.org/10.1109/TVCG.2006.58 db/journals/tvcg/tvcg12.html#HouseBW06