Porras, Ina; Barton, David Nicholas; Chacon, Adriana; Miranda, Miriam. Porras, I., Barton, D.N., Miranda, M., Chacón, A. (2013). Leaning from twenty years of the Costa Rican Payments for Environmental Services Programme. http://pubs.iied.org/pdfs/16514IIED.pdf. London: IIED 2013 (ISBN 978-1-84369-855-5) 71 p. NINA
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