Johnson JA, Lerner HRL, Rasmussen PC, Mindell DP (2006) Systematics within Gyps vultures: a clade at risk. BMC Evolutionary Biology 6:65

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Lerner, H.R.L. and Mindell, D. P. (2005) Phylogeny of eagles, Old World vultures and other Accipitridae based on nuclear and mitochondrial DNA. Molecular Phylogenetics and Evolution 37 (2):  327-346
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Bunce, M., Szulkin, M., Lerner, H.R.L., Barnes, I., Shapir, B., Cooper, A.and Holdaway, R.N. (2005) The evolutionary history of New Zealand's extinct giant eagle revealed by ancient DNA.  PLoS Biol 3(1):e9
PLoS Biol  (open access)