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Ahmed, S., J. R. Stepp, R. A. J. Toleno, and C. M. Peters. 2010. Increased market integration, value, and ecological knowledge of tea agro-forests in the Akha highlands of southwest China. Ecology and Society 15(4): 27. https://doi.org/10.5751/ES-03728-150427
Ahmed et al. (Fri,) studied this question.