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Fuchs, Jérôme; Johnson, Jeff A.; Mindell, David P. (2012-03-05). "Molecular systematics of the caracaras and allies (Falconidae: Polyborinae) inferred from mitochondrial and nuclear sequence data". Ibis. 154 (3). Wiley: 520–532. doi:10.1111/j.1474-919x.2012.01222.x. ISSN0019-1019.