Jenshiuh Liu Chih-Hsien Huang Don-Lin Yang Parallel Volume Rendering with Sparse Data Structures. 327-339 2005 21 J. Inf. Sci. Eng. 2 http://www.iis.sinica.edu.tw/page/jise/2005/200503_05.html db/journals/jise/jise21.html#LiuHY05