Virtual playground: architectures for a shared virtual world. - Paul Schwartz; Lauren J. Bricker; Bruce Campbell; Thomas A. Furness; Kori Inkpen; Lydia Matheson; Nobutatsu Nakamura; Li-Sheng Shen; Susan Tanney; Shihming Yen (VRST, 1998)

Ladakh: An internet 3D multiuser system. - Nobutatsu Nakamura; Kozo Satoda; Ryuichi Hiraike; Keiji Nemoto (Syst. Comput. Jpn., 1999)

A Flexible Replication Mechanism with Extended Database Connection Layers. - Nobutatsu Nakamura; Ken-ichiro Fujiyama; Eiji Kawai; Hideki Sunahara (NCA, 2006)

Database Transaction Management for High-Availability Cluster System. - Ken-ichiro Fujiyama; Nobutatsu Nakamura; Ryuichi Hiraike (PRDC, 2006)