Lina Sarmiento, Maximina Monasterio, Miguel Montilla, Ecological Bases, Sustainability, and Current Trends in Traditional Agriculture in the Venezuelan High Andes, Mountain Research and Development, Vol. 13, No. 2, Mountain Geoecology of the Andes: Resource Management and Sustainable Development (May, 1993), pp. 167-176
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Sarmiento et al. (1993) studied this question.