Robert Kosara Fabian Bendix Helwig Hauser Parallel Sets: Interactive Exploration and Visual Analysis of Categorical Data. 558-568 2006 12 IEEE Trans. Vis. Comput. Graph. 4 http://doi.ieeecomputersociety.org/10.1109/TVCG.2006.76 db/journals/tvcg/tvcg12.html#KosaraBH06