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HOMBERGER DG (1991) The evolutionary history ofparrots and cockatoos: a model for evolution in theAustralasian avifauna. Pp. 398ñ403 en: BELL BD,COSSEE RO, FLUX JEC, HEATHER BC, HITCHMOUGH RA,ROBERTSON CJR Y WILLIAMS MJ (eds) Acta XXCongressus Internationalis Ornithologici. New ZealandOrnithological Congress Trust Board, Wellington
FORSHAW JM (1989) Parrots of the world. Third edi-tion. Landsdowne Editions, Willoughby
JOSEPH L (2000) Begining an end to uncertain: theNeotropical parakeets known as Pyrrhura picta andP. leucotis comprise more than two species. Proceed-ings of the Academy of Natural Sciences of Phila-delphia 150:279ñ292
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