Ceddia, M. G.; Bardsley, N. O.; Gomez-y-Paloma, S.; Sedlacek, S. (5 de mayo de 2014). «Governance, agricultural intensification, and land sparing in tropical South America». Proceedings of the National Academy of Sciences (Proceedings of the National Academy of Sciences) 111 (20): 7242-7247. ISSN0027-8424. doi:10.1073/pnas.1317967111.
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Ceddia, M. G.; Bardsley, N. O.; Gomez-y-Paloma, S.; Sedlacek, S. (5 de mayo de 2014). «Governance, agricultural intensification, and land sparing in tropical South America». Proceedings of the National Academy of Sciences (Proceedings of the National Academy of Sciences) 111 (20): 7242-7247. ISSN0027-8424. doi:10.1073/pnas.1317967111.