Frank A. Einhellig, James A. Rasmussen, Allelopathic Effects of Rumex crispus on Amaranthus retroflexus, Grain Sorghum and Field Corn, The American Midland Naturalist, Vol. 90, No. 1 (Jul., 1973), pp. 79-86
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Einhellig et al. (1973) studied this question.
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