Yoshiki Arakawa Hideki Kakeya Mitsuo Isogai Kenji Suzuki Fujio Yamaguchi Space-Shared Communication Based on Truly 3D Information Space. 31-35 1999 ICIP (3) db/conf/icip/icip1999-3.html#ArakawaKISY99 http://dx.doi.org/10.1109/ICIP.1999.817063