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  • Calter, Paul. "Brunelleschi's peepshow and the origins of perspective." Dartmouth College. 1998. http://www.dartmouth.edu/~matc/math5.geometry/unit11/unit11.html
  • Sample, Ian. "How the Laughing Cavalier keeps an eye on everybody." The Guardian. September 22, 2004. http://www.guardian.co.uk/science/2004/sep/22/arts.science
  • Viegas, Jennifer. "Moving eye mystery solved." ABC. October 4, 2004. http://www.abc.net.au/science/news/stories/s1212545.htm
  • "Study reveals why eyes in some paintings seem to follow viewers." Ohio State University. September 20, 2004. http://researchnews.osu.edu/archive/eyefolow.htm