E. J. Milner-Gulland, N. Leader-Williams, A Model of Incentives for the Illegal Exploitation of Black Rhinos and Elephants: Poaching Pays in Luangwa Valley, Zambia, Journal of Applied Ecology, Vol. 29, No. 2 (1992), pp. 388-401
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Milner‐Gulland et al. (1992) studied this question.
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