Virtual Shadows - Enhanced Interaction in Mixed Reality Environment. - Takeshi Naemura; Takuya Nitta; Atsushi Mimura; Hiroshi Harashima (VR, 2002)

A Design Principle and Collaborative Learning Support Method in Game-based Learning Environment. - Ryo Takaoka; Masayuki Shimokawa; Takuya Nitta; Toshio Okamoto (ICCE, 2012)