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Leal, Inara R.; Silva, José Maria Cardoso Da; Tabarelli, Marcelo; Lacher, Thomas E. (2005). «Changing the Course of Biodiversity Conservation in the Caatinga of Northeastern Brazil». Conservation Biology (på engelsk) 19 (3): 701–706. ISSN1523-1739. doi:10.1111/j.1523-1739.2005.00703.x.
