Andrew E. Johnson Thomas G. Moher Yongjoo Cho Ya Ju Lin David Haas Janet Kim Augmenting Elementary School Education with VR. 6-9 2002 22 IEEE Computer Graphics and Applications 2 http://dlib.computer.org/cg/books/cg2002/pdf/g2006.pdf db/journals/cga/cga22.html#JohnsonMCLHK02