Jonathan Woodring Han-Wei Shen Chronovolumes: A Direct Rendering Technique for Visualizing Time-Varying Data. 27-34 2003 conf/vg/2003 Volume Graphics http://www.eg.org/EG/DL/WS/VG03/027-034-woodring-paper.pdf db/conf/vg/vg2003.html#WoodringS03