Masahiko Inami, Naoki Kawakami, Dairoku Sekiguchi, Yasuyuki Yanagida, Taro Maeda, Susumu Tachi, Kunihiko Mabuchi: Head-mounted projector for projection of virtual environments on ubiquitous object-oriented retroreflective screens in real environment. SIGGRAPH Abstracts and Applications 1999: 245