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2. Benites, G. 2015. Protocolo de monitoreo socioeconómico en la comunidad de Huamantanga, cuenca del rio Chillon. Unpublished report.
3. Bennett, G., Carrol, N., Hamilton, C., 2013. Charting new waters: State of Watershed Payments 939 2012, in: Forest trends' ecosystem marketplace, Wasthington, D.C., pp. 78, http://www.forest940trends.org/documents/files/doc_3308.pdf
4. Utility engagement with payments for watershed services in the United States;Bennett;Ecosyst. Serv.,2014
5. Bennett, G., Carroll, N., 2014. Gaining depth: State of watershed investment, in: Forest trends ecosystem marketplace, Washington, D.C.