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			| Arnold E. Stoper
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								M. M. Cohen, A. E. Stoper, R. B. Welch,  & C. W. DeRoshia (2001) Effects of Gravitational and Optical Stimulation on the Perception of Target Elevation, Perception and Psychophysics, 2001, 63(1): 29-35
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								A. E. Stoper,  & M. M. Cohen (1996) The Effects of Environmental Pitch on Perceived Optic Slant and Eye Level: Lines vs Dots, Paper presented to the 19th European Conference on Visual Perception, Strasbourg, France, September 7, 1996.
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