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Bruno Messerli, Martin Grosjean, Mathias Vuille, Water Availability, Protected Areas, and Natural Resources in the Andean Desert Altiplano, Mountain Research and Development, Vol. 17, No. 3, The United Nations University. Managing Fragile Ecosystems in the Andes (Aug., 1997), pp. 229-238
Messerli et al. (Fri,) studied this question.