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                    <http://www.hitl.washington.edu/scivw/EVE/III.A.1.b.StereoscopicViewing.html>

(4) Brian, Marshall. "How 3-D Glasses Work." HowStuffWorks. 2005. HowStuffWorks, Inc. 26 April 2005

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(5) Cooper, Rachel. "3D Depth Perception." The Visual Learning Center. 2005. Doctors Vision Center. 27 April 2005

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