Intuitive control of "bird's eye" overview images for navigation in an enormous virtual environment. - Shinji Fukatsu; Yoshifumi Kitamura; Toshihiro Masaki; Fumio Kishino (VRST, 1998)

Manipulation of Viewpoints in 3D Environment Using Interlocked Motion of Coordinate Pairs. - Shinji Fukatsu; Yoshifumi Kitamura; Fumio Kishino (INTERACT, 2003)