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The Perception of the Visual World,

Houghton Mifflin Co., Boston, 1950.

Giese, A. C., “The Photobiology of Blepharisma,” talk at the third annual meeting, American Society for Photobiology, June 23, 1975.

Goethe, Johann Wolfgang von,

Theory of Colours (Farbenlehre),

translated by Charles Lock Eastlake, John Murray, London, 1840.

Goldstein, Kurt,

The Organism,

American Book Co., New York, 1939.

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