Realization of Digital Environmental Education - A Future Style of Environmental Education in Dynamically Changing Virtual Environment. - Masaya Okada; Hiroyuki Tarumi; Tetsuhiko Yoshimura; Kazuyuki Moriya; Tetsuro Sakai (Digital Cities, 2001)

Distributed virtual environment realizing collaborative environment education. - Masaya Okada; Hiroyuki Tarumi; Tetsuhiko Yoshimura (SAC, 2001)

DigitalEE: A support system for collaborative environmental education using distributed virtual space. - Masaya Okada; Tetsuhiko Yoshimura; Hiroyuki Tarumi; Kazuyuki Moriya; Tetsuro Sakai (Syst. Comput. Jpn., 2002)