Hiroshi Akiba Nathaniel Fout Kwan-Liu Ma Simultaneous Classification of Time-Varying Volume Data Based on the Time Histogram. 171-178 2006 conf/vissym/2006 EuroVis http://dx.doi.org/10.2312/VisSym/EuroVis06/171-178 db/conf/vissym/eurovis2006.html#AkibaFM06