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Sheldon, Frederick H; Whittingham, Linda A; Moyle, Robert G; Slikas, Beth; Winkler, David W (2005). «Phylogeny of swallows (Aves: Hirundinidae) estimated from nuclear and mitochondrial DNA». Molecular Phylogenetics & Evolution. 35 (1): 254–270. PMID15737595. doi:10.1016/j.ympev.2004.11.008