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Benz, Brett W.; Robbins, Mark B.; Peterson, A. Townsend. Evolutionary history of woodpeckers and allies (Aves: Picidae): Placing key taxa on the phylogenetic tree. Molecular Phylogenetics and Evolution. 2006, 40 (2): 389–399. PMID 16635580. doi:10.1016/j.ympev.2006.02.021.