Jean-François El Hajjar Stephane Marchesin Jean-Michel Dischler Catherine Mongenet Second Order Pre-Integrated Volume Rendering. 9-16 2008 PacificVis http://dx.doi.org/10.1109/PACIFICVIS.2008.4475453 conf/apvis/2008 db/conf/apvis/pacificvis2008.html#HajjarMDM08