Below are links to reports, journals, studies, papers, articles, documents, and websites on the subject.
You will need Adobe Acrobat to view the pdf files.
Horizontal Gaze Nystagamus: A Review of Vision Science and Application Issues
Journal of Forensic Sciences 2010 - by Steven J. Rubenzer, Ph.D. and Scott B. Stevenson, Ph.D.
The Robustness of the Horizontal Gaze Nystagamus Test - 2008 NHTSA Publication
The Horizontal Gaze Nystagamus Test: fraudulent science in the American courts - A paper by Dr. J.L. Booker Science & Justice Vol. 44 No.3.
HORIZONTAL GAZE NYSTAGMUS: THE SCIENCE & THE LAW A Resource Guide for Judges, Prosecutors and Law Enforcement