S. J. Ellern, John L. Harper, G. R. Sagar, A Comparative Study of the Distribution of the Roots of Avena Fatua and A. Strigosa in Mixed Stands Using a C-Labelling Technique, Journal of Ecology, Vol. 58, No. 3 (Nov., 1970), pp. 865-868
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Ellern et al. (1970) studied this question.
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