Yoshinao Aoki Shin Tanahashi Osamu Kinoshita Hideaki Nakamura Development of a System for Producing Stereo Ground Models by Optical Lithography. 457-460 1992 MVA http://b2.cvl.iis.u-tokyo.ac.jp/mva/proceedings/CommemorativeDVD/1992/papers/1992457.pdf conf/mva/1992 db/conf/mva/mva1992.html#AokiTKN92