Hans-Heino Ehricke Gerhard Daiber Wolfgang Straßer The Vision Camera: An Interactive Tool for Volume Data Exploration and Navigation. 25-31 1993 conf/visualization/1993 IEEE Visualization db/conf/visualization/visualization1993.html#EhrickeDS93 https://doi.org/10.1109/VISUAL.1993.398847 https://doi.ieeecomputersociety.org/10.1109/VISUAL.1993.398847 http://dl.acm.org/citation.cfm?id=949855