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R. K. Szaniawski, M. S. Adams, Root Respiration of Tsuga canadensis Seedlings as Influenced by Intensity of Net Photosynthesis and Dark Respiration of Shoots, The American Midland Naturalist, Vol. 91, No. 2 (Apr., 1974), pp. 464-468
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Szaniawski et al. (1974) studied this question.
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