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Russello, Michael A., and George Amato. A molecular phylogeny of Amazona: implications for Neotropical parrot biogeography, taxonomy, and conservation. Molecular Phylogenetics and Evolution. 2004, 30 (2): 421–437. PMID 14715233. doi:10.1016/S1055-7903(03)00192-1.
Russello, Michael A., and George Amato. A molecular phylogeny of Amazona: implications for Neotropical parrot biogeography, taxonomy, and conservation. Molecular Phylogenetics and Evolution. 2004, 30 (2): 421–437. PMID 14715233. doi:10.1016/S1055-7903(03)00192-1.