D. C. Le Maitre, B. W. Van Wilgen, R. A. Chapman, D. H. McKelly, Invasive Plants and Water Resources in the Western Cape Province, South Africa: Modelling the Consequences of a Lack of Management, Journal of Applied Ecology, Vol. 33, No. 1 (Feb., 1996), pp. 161-172
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Maître et al. (1996) studied this question.