"Those Who Do Not Learn History Are Doomed To Repeat It."
Masters Thesis from 1998 .
http://scholar.lib.vt.edu/theses/public/etd-11198-94048/materials/etd.pdf
VR4 HMD
http://www.virtualresearch.com/Acrobat_files/VR_VR4man.pdf
Assessing Negative Side Effects in Virtual Enviornments
