Masaki Naito Buntarou Shizuki Jiro Tanaka Hiroshi Hosobe Interaction Techniques Using a Spherical Cursor for 3D Targets Acquisition and Indicating in Volumetric Displays. 607-612 2009 IV http://dx.doi.org/10.1109/IV.2009.70 conf/iv/2009 db/conf/iv/iv2009.html#NaitoSTH09