L. J. Shainsky, S. R. Radosevich, Growth and Water Relations of Pinus Ponderosa Seedlings in Competitive Regimes with Arctostaphylos patula Seedlings, Journal of Applied Ecology, Vol. 23, No. 3 (Dec., 1986), pp. 957-966
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Shainsky et al. (1986) studied this question.
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