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D. D. Baldocchi, B. A. Hutchison, D. R. Matt, R. T. McMillen, Canopy Radiative Transfer Models for Spherical and Known Leaf Inclination Angle Distributions: A Test in an Oak-Hickory Forest, Journal of Applied Ecology, Vol. 22, No. 2 (Aug., 1985), pp. 539-555
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Baldocchi et al. (1985) studied this question.
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