1. E.C. Regan, K.R. Price, Some side-effects of immersion Virtual Reality. Army Personnel Research Establishment, Farnborough, Hants. APRE Report No. 93RO10, 1993.
2. E.C. Regan, K.R. Price, Some side-effects of immersion Virtual Reality: The effects of increasing head movements, of rapid interaction, and of seating subjects. Army Personnel Research Establishment, Farnborough, Hants. APRE Report 93R022, 1993.
3. E.C. Regan, K.R. Price, Some side-effects of immersion Virtual Reality: An investigation into the relationship between Inter-pupillary Distance and ocular related problems. Army Personnel Research Establishment, Farnborough, Hants. APRE Report 93RO23, 1993.
4. P.A. Howarth, P.J. Costello, Visual effects of immersion in virtual environments: Interim results from the UK Health and Safety executive study. Society for Information Display International Symposium Digest of Technical Papers, San Diego, 12–17 May, 1996, XXVII, pp. 885–888.
5. P.J. Costello, P.A. Howarth, The effects on the visual system of wearing a Head-Mounted Display for an hour. 1996, VISERG Internal Report 9605.