Joe Kniss Simon Premoze Milan Ikits Aaron E. Lefohn Charles D. Hansen Emil Praun Gaussian Transfer Functions for Multi-Field Volume Visualization. 497-504 2003 conf/visualization/2003 IEEE Visualization db/conf/visualization/visualization2003.html#KnissPILHP03 http://doi.ieeecomputersociety.org/10.1109/VISUAL.2003.1250412