Naohisa Sakamoto Ding Zhongming Takuma Kawamura Koji Koyamada Hardware-Accelerated Particle-Based Volume Rendering for Multiple Irregular Volumes. 970-979 2008 ISVC (2) http://dx.doi.org/10.1007/978-3-540-89646-3_97 conf/isvc/2008-2 db/conf/isvc/isvc2008-2.html#SakamotoZKK08