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W. J. Trewhella, Stephen Harris, G. C. Smith, A. K. Nadian, A Field Trial Evaluating Bait Uptake by an Urban Fox (Vulpes vulpes) Population, Journal of Applied Ecology, Vol. 28, No. 2 (Aug., 1991), pp. 454-466
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Trewhella et al. (1991) studied this question.
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