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María Silvia Cid, Tomás A. López, Cristina Yagueddú, Miguel A. Brizuela, Acute Toxic Plant Estimation in Grazing Sheep Ingesta and Feces, Journal of Range Management, Vol. 56, No. 4 (Jul., 2003), pp. 353-357
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Cid et al. (2003) studied this question.
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