L. G. Firbank, R. Cousens, A. M. Mortimer, R. G. R. Smith, Effects of Soil Type on Crop Yield-Weed Density Relationships Between Winter Wheat and Bromus sterilis, Journal of Applied Ecology, Vol. 27, No. 1 (Apr., 1990), pp. 308-318
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Firbank et al. (1990) studied this question.
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