Masahiro Watanabe Motoi Okuda Yukihiro Karube Ryuichi Matsukura Teruo Matsuzawa Collaborative Environment with Visualizing Medical Volume Data by Virtual Reality. 347-352 2007 PDCAT http://doi.ieeecomputersociety.org/10.1109/PDCAT.2007.84 conf/pdcat/2007 db/conf/pdcat/pdcat2007.html#WatanabeOKMM07