Yue Wang Soon Tee Teoh Kwan-Liu Ma Evaluating the Effectiveness of Tree Visualization Systems for Knowledge Discovery. 67-74 2006 conf/vissym/2006 EuroVis http://dx.doi.org/10.2312/VisSym/EuroVis06/067-074 db/conf/vissym/eurovis2006.html#WangTM06