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Peter A. Huxley, The Effects of Artificial Shading on Some Growth Characteristics of Arabica and Robusta Coffee Seedlings. I. The Effects of Shading on Dry Weight, Leaf Area and Derived Growth Data, Journal of Applied Ecology, Vol. 4, No. 2 (Nov., 1967), pp. 291-308
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P. A. Huxley (1967) studied this question.
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