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nih.gov
pubmed.ncbi.nlm.nih.gov
Thomassen, Henri A.; Den Tex, Robert-Jan; De Bakker, Merijn A.G.; Povel, G. David E. (2005). "Phylogenetic relationships amongst swifts and swiftlets: A multi locus approach". Molecular Phylogenetics and Evolution. 37 (1): 264–277. doi:10.1016/j.ympev.2005.05.010. PMID16006151.